algebra.ring.equiv ⟷ Mathlib.Algebra.Ring.Equiv

mathlib commit https://github.com/leanprover-community/mathlib/commit/65a1391a0106c9204fe45bc73a039f056558cb83

@@ -4,7 +4,7 @@ Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Johannes Hölzl, Callum Sutton, Yury Kudryashov
 -/
 import Algebra.Group.Opposite
-import Algebra.Hom.Ring
+import Algebra.Ring.Hom.Defs
 import Logic.Equiv.Set
 import Tactic.AssertExists
 

mathlib commit https://github.com/leanprover-community/mathlib/commit/65a1391a0106c9204fe45bc73a039f056558cb83

@@ -87,7 +87,7 @@ instance (priority := 100) toRingHomClass (F R S : Type _) [NonAssocSemiring R]
     [h : RingEquivClass F R S] : RingHomClass F R S :=
   { h with
     coe := coeFn
-    coe_injective' := FunLike.coe_injective
+    coe_injective' := DFunLike.coe_injective
     map_zero := map_zero
     map_one := map_one }
 #align ring_equiv_class.to_ring_hom_class RingEquivClass.toRingHomClass
@@ -99,7 +99,7 @@ instance (priority := 100) toNonUnitalRingHomClass (F R S : Type _) [NonUnitalNo
     [NonUnitalNonAssocSemiring S] [h : RingEquivClass F R S] : NonUnitalRingHomClass F R S :=
   { h with
     coe := coeFn
-    coe_injective' := FunLike.coe_injective
+    coe_injective' := DFunLike.coe_injective
     map_zero := map_zero }
 #align ring_equiv_class.to_non_unital_ring_hom_class RingEquivClass.toNonUnitalRingHomClass
 -/
@@ -171,7 +171,7 @@ protected theorem map_add (e : R ≃+* S) (x y : R) : e (x + y) = e x + e y :=
     same underlying function. -/
 @[ext]
 theorem ext {f g : R ≃+* S} (h : ∀ x, f x = g x) : f = g :=
-  FunLike.ext f g h
+  DFunLike.ext f g h
 #align ring_equiv.ext RingEquiv.ext
 -/
 
@@ -189,19 +189,19 @@ theorem mk_coe (e : R ≃+* S) (e' h₁ h₂ h₃ h₄) : (⟨e, e', h₁, h₂,
 
 #print RingEquiv.congr_arg /-
 protected theorem congr_arg {f : R ≃+* S} {x x' : R} : x = x' → f x = f x' :=
-  FunLike.congr_arg f
+  DFunLike.congr_arg f
 #align ring_equiv.congr_arg RingEquiv.congr_arg
 -/
 
 #print RingEquiv.congr_fun /-
 protected theorem congr_fun {f g : R ≃+* S} (h : f = g) (x : R) : f x = g x :=
-  FunLike.congr_fun h x
+  DFunLike.congr_fun h x
 #align ring_equiv.congr_fun RingEquiv.congr_fun
 -/
 
 #print RingEquiv.ext_iff /-
 protected theorem ext_iff {f g : R ≃+* S} : f = g ↔ ∀ x, f x = g x :=
-  FunLike.ext_iff
+  DFunLike.ext_iff
 #align ring_equiv.ext_iff RingEquiv.ext_iff
 -/
 
@@ -963,8 +963,8 @@ def ofHomInv' {R S F G : Type _} [NonUnitalNonAssocSemiring R] [NonUnitalNonAsso
     where
   toFun := hom
   invFun := inv
-  left_inv := FunLike.congr_fun hom_inv_id
-  right_inv := FunLike.congr_fun inv_hom_id
+  left_inv := DFunLike.congr_fun hom_inv_id
+  right_inv := DFunLike.congr_fun inv_hom_id
   map_mul' := map_mul hom
   map_add' := map_add hom
 #align ring_equiv.of_hom_inv' RingEquiv.ofHomInv'
@@ -982,8 +982,8 @@ def ofHomInv {R S F G : Type _} [NonAssocSemiring R] [NonAssocSemiring S] [RingH
     where
   toFun := hom
   invFun := inv
-  left_inv := FunLike.congr_fun hom_inv_id
-  right_inv := FunLike.congr_fun inv_hom_id
+  left_inv := DFunLike.congr_fun hom_inv_id
+  right_inv := DFunLike.congr_fun inv_hom_id
   map_mul' := map_mul hom
   map_add' := map_add hom
 #align ring_equiv.of_hom_inv RingEquiv.ofHomInv

mathlib commit https://github.com/leanprover-community/mathlib/commit/ce64cd319bb6b3e82f31c2d38e79080d377be451

@@ -3,10 +3,10 @@ Copyright (c) 2018 Johannes Hölzl. All rights reserved.
 Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Johannes Hölzl, Callum Sutton, Yury Kudryashov
 -/
-import Mathbin.Algebra.Group.Opposite
-import Mathbin.Algebra.Hom.Ring
-import Mathbin.Logic.Equiv.Set
-import Mathbin.Tactic.AssertExists
+import Algebra.Group.Opposite
+import Algebra.Hom.Ring
+import Logic.Equiv.Set
+import Tactic.AssertExists
 
 #align_import algebra.ring.equiv from "leanprover-community/mathlib"@"00f91228655eecdcd3ac97a7fd8dbcb139fe990a"
 

mathlib commit https://github.com/leanprover-community/mathlib/commit/32a7e535287f9c73f2e4d2aef306a39190f0b504

@@ -1047,7 +1047,6 @@ theorem symm_trans_self (e : R ≃+* S) : e.symm.trans e = RingEquiv.refl S :=
 #align ring_equiv.symm_trans_self RingEquiv.symm_trans_self
 -/
 
-#print RingEquiv.noZeroDivisors /-
 /-- If two rings are isomorphic, and the second doesn't have zero divisors,
 then so does the first. -/
 protected theorem noZeroDivisors {A : Type _} (B : Type _) [Ring A] [Ring B] [NoZeroDivisors B]
@@ -1058,9 +1057,7 @@ protected theorem noZeroDivisors {A : Type _} (B : Type _) [Ring A] [Ring B] [No
       have : e x * e y = 0 := by rw [← e.map_mul, hxy, e.map_zero]
       simpa using eq_zero_or_eq_zero_of_mul_eq_zero this }
 #align ring_equiv.no_zero_divisors RingEquiv.noZeroDivisors
--/
 
-#print RingEquiv.isDomain /-
 /-- If two rings are isomorphic, and the second is a domain, then so is the first. -/
 protected theorem isDomain {A : Type _} (B : Type _) [Ring A] [Ring B] [IsDomain B] (e : A ≃+* B) :
     IsDomain A :=
@@ -1069,7 +1066,6 @@ protected theorem isDomain {A : Type _} (B : Type _) [Ring A] [Ring B] [IsDomain
   haveI := e.no_zero_divisors B
   exact NoZeroDivisors.to_isDomain _
 #align ring_equiv.is_domain RingEquiv.isDomain
--/
 
 end RingEquiv
 

mathlib commit https://github.com/leanprover-community/mathlib/commit/32a7e535287f9c73f2e4d2aef306a39190f0b504

@@ -126,7 +126,7 @@ instance : RingEquivClass (R ≃+* S) R S where
   inv := invFun
   coe_injective' e f h₁ h₂ := by cases e; cases f; congr
   map_add := map_add'
-  map_mul := map_mul'
+  map_hMul := map_mul'
   left_inv := RingEquiv.left_inv
   right_inv := RingEquiv.right_inv
 

mathlib commit https://github.com/leanprover-community/mathlib/commit/8ea5598db6caeddde6cb734aa179cc2408dbd345

@@ -2,17 +2,14 @@
 Copyright (c) 2018 Johannes Hölzl. All rights reserved.
 Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Johannes Hölzl, Callum Sutton, Yury Kudryashov
-
-! This file was ported from Lean 3 source module algebra.ring.equiv
-! leanprover-community/mathlib commit 00f91228655eecdcd3ac97a7fd8dbcb139fe990a
-! Please do not edit these lines, except to modify the commit id
-! if you have ported upstream changes.
 -/
 import Mathbin.Algebra.Group.Opposite
 import Mathbin.Algebra.Hom.Ring
 import Mathbin.Logic.Equiv.Set
 import Mathbin.Tactic.AssertExists
 
+#align_import algebra.ring.equiv from "leanprover-community/mathlib"@"00f91228655eecdcd3ac97a7fd8dbcb139fe990a"
+
 /-!
 # (Semi)ring equivs
 

mathlib commit https://github.com/leanprover-community/mathlib/commit/8b981918a93bc45a8600de608cde7944a80d92b9

@@ -738,13 +738,11 @@ theorem toNonUnitalRingHom_injective :
 #align ring_equiv.to_non_unital_ring_hom_injective RingEquiv.toNonUnitalRingHom_injective
 -/
 
-#print RingEquiv.instCoeToNonUnitalRingHom /-
 /- The instance priority is lowered here so that in the case when `R` and `S` are both unital, Lean
 will first find and use `ring_equiv.has_coe_to_ring_hom`. -/
-instance (priority := 900) instCoeToNonUnitalRingHom : Coe (R ≃+* S) (R →ₙ+* S) :=
+instance (priority := 900) hasCoeToNonUnitalRingHom : Coe (R ≃+* S) (R →ₙ+* S) :=
   ⟨RingEquiv.toNonUnitalRingHom⟩
-#align ring_equiv.has_coe_to_non_unital_ring_hom RingEquiv.instCoeToNonUnitalRingHom
--/
+#align ring_equiv.has_coe_to_non_unital_ring_hom RingEquiv.hasCoeToNonUnitalRingHom
 
 #print RingEquiv.toNonUnitalRingHom_eq_coe /-
 theorem toNonUnitalRingHom_eq_coe (f : R ≃+* S) : f.toNonUnitalRingHom = ↑f :=
@@ -830,11 +828,9 @@ theorem toRingHom_injective : Function.Injective (toRingHom : R ≃+* S → R 
 #align ring_equiv.to_ring_hom_injective RingEquiv.toRingHom_injective
 -/
 
-#print RingEquiv.instCoeToRingHom /-
-instance instCoeToRingHom : Coe (R ≃+* S) (R →+* S) :=
+instance hasCoeToRingHom : Coe (R ≃+* S) (R →+* S) :=
   ⟨RingEquiv.toRingHom⟩
-#align ring_equiv.has_coe_to_ring_hom RingEquiv.instCoeToRingHom
--/
+#align ring_equiv.has_coe_to_ring_hom RingEquiv.hasCoeToRingHom
 
 #print RingEquiv.toRingHom_eq_coe /-
 theorem toRingHom_eq_coe (f : R ≃+* S) : f.toRingHom = ↑f :=

mathlib commit https://github.com/leanprover-community/mathlib/commit/9fb8964792b4237dac6200193a0d533f1b3f7423

@@ -47,12 +47,13 @@ equiv, mul_equiv, add_equiv, ring_equiv, mul_aut, add_aut, ring_aut
 
 variable {F α β R S S' : Type _}
 
+#print RingEquiv /-
 /-- An equivalence between two (non-unital non-associative semi)rings that preserves the
 algebraic structure. -/
 structure RingEquiv (R S : Type _) [Mul R] [Add R] [Mul S] [Add S] extends R ≃ S, R ≃* S, R ≃+ S
 #align ring_equiv RingEquiv
+-/
 
--- mathport name: «expr ≃+* »
 infixl:25 " ≃+* " => RingEquiv
 
 /-- The "plain" equivalence of types underlying an equivalence of (semi)rings. -/
@@ -83,6 +84,7 @@ instance (priority := 100) toAddEquivClass (F R S : Type _) [Mul R] [Add R] [Mul
 #align ring_equiv_class.to_add_equiv_class RingEquivClass.toAddEquivClass
 -/
 
+#print RingEquivClass.toRingHomClass /-
 -- See note [lower instance priority]
 instance (priority := 100) toRingHomClass (F R S : Type _) [NonAssocSemiring R] [NonAssocSemiring S]
     [h : RingEquivClass F R S] : RingHomClass F R S :=
@@ -92,7 +94,9 @@ instance (priority := 100) toRingHomClass (F R S : Type _) [NonAssocSemiring R]
     map_zero := map_zero
     map_one := map_one }
 #align ring_equiv_class.to_ring_hom_class RingEquivClass.toRingHomClass
+-/
 
+#print RingEquivClass.toNonUnitalRingHomClass /-
 -- See note [lower instance priority]
 instance (priority := 100) toNonUnitalRingHomClass (F R S : Type _) [NonUnitalNonAssocSemiring R]
     [NonUnitalNonAssocSemiring S] [h : RingEquivClass F R S] : NonUnitalRingHomClass F R S :=
@@ -101,6 +105,7 @@ instance (priority := 100) toNonUnitalRingHomClass (F R S : Type _) [NonUnitalNo
     coe_injective' := FunLike.coe_injective
     map_zero := map_zero }
 #align ring_equiv_class.to_non_unital_ring_hom_class RingEquivClass.toNonUnitalRingHomClass
+-/
 
 end RingEquivClass
 
@@ -131,84 +136,112 @@ instance : RingEquivClass (R ≃+* S) R S where
 instance : CoeFun (R ≃+* S) fun _ => R → S :=
   ⟨RingEquiv.toFun⟩
 
+#print RingEquiv.toEquiv_eq_coe /-
 @[simp]
 theorem toEquiv_eq_coe (f : R ≃+* S) : f.toEquiv = f :=
   rfl
 #align ring_equiv.to_equiv_eq_coe RingEquiv.toEquiv_eq_coe
+-/
 
 @[simp]
 theorem toFun_eq_coe (f : R ≃+* S) : f.toFun = f :=
   rfl
 #align ring_equiv.to_fun_eq_coe RingEquiv.toFun_eq_coe
 
+#print RingEquiv.coe_toEquiv /-
 @[simp]
 theorem coe_toEquiv (f : R ≃+* S) : ⇑(f : R ≃ S) = f :=
   rfl
 #align ring_equiv.coe_to_equiv RingEquiv.coe_toEquiv
+-/
 
+#print RingEquiv.map_mul /-
 /-- A ring isomorphism preserves multiplication. -/
 protected theorem map_mul (e : R ≃+* S) (x y : R) : e (x * y) = e x * e y :=
   map_mul e x y
 #align ring_equiv.map_mul RingEquiv.map_mul
+-/
 
+#print RingEquiv.map_add /-
 /-- A ring isomorphism preserves addition. -/
 protected theorem map_add (e : R ≃+* S) (x y : R) : e (x + y) = e x + e y :=
   map_add e x y
 #align ring_equiv.map_add RingEquiv.map_add
+-/
 
+#print RingEquiv.ext /-
 /-- Two ring isomorphisms agree if they are defined by the
     same underlying function. -/
 @[ext]
 theorem ext {f g : R ≃+* S} (h : ∀ x, f x = g x) : f = g :=
   FunLike.ext f g h
 #align ring_equiv.ext RingEquiv.ext
+-/
 
 @[simp]
 theorem coe_mk (e e' h₁ h₂ h₃ h₄) : ⇑(⟨e, e', h₁, h₂, h₃, h₄⟩ : R ≃+* S) = e :=
   rfl
 #align ring_equiv.coe_mk RingEquiv.coe_mkₓ
 
+#print RingEquiv.mk_coe /-
 @[simp]
 theorem mk_coe (e : R ≃+* S) (e' h₁ h₂ h₃ h₄) : (⟨e, e', h₁, h₂, h₃, h₄⟩ : R ≃+* S) = e :=
   ext fun _ => rfl
 #align ring_equiv.mk_coe RingEquiv.mk_coe
+-/
 
+#print RingEquiv.congr_arg /-
 protected theorem congr_arg {f : R ≃+* S} {x x' : R} : x = x' → f x = f x' :=
   FunLike.congr_arg f
 #align ring_equiv.congr_arg RingEquiv.congr_arg
+-/
 
+#print RingEquiv.congr_fun /-
 protected theorem congr_fun {f g : R ≃+* S} (h : f = g) (x : R) : f x = g x :=
   FunLike.congr_fun h x
 #align ring_equiv.congr_fun RingEquiv.congr_fun
+-/
 
+#print RingEquiv.ext_iff /-
 protected theorem ext_iff {f g : R ≃+* S} : f = g ↔ ∀ x, f x = g x :=
   FunLike.ext_iff
 #align ring_equiv.ext_iff RingEquiv.ext_iff
+-/
 
+#print RingEquiv.toAddEquiv_eq_coe /-
 @[simp]
 theorem toAddEquiv_eq_coe (f : R ≃+* S) : f.toAddEquiv = ↑f :=
   rfl
 #align ring_equiv.to_add_equiv_eq_coe RingEquiv.toAddEquiv_eq_coe
+-/
 
+#print RingEquiv.toMulEquiv_eq_coe /-
 @[simp]
 theorem toMulEquiv_eq_coe (f : R ≃+* S) : f.toMulEquiv = ↑f :=
   rfl
 #align ring_equiv.to_mul_equiv_eq_coe RingEquiv.toMulEquiv_eq_coe
+-/
 
+#print RingEquiv.coe_toMulEquiv /-
 @[simp, norm_cast]
 theorem coe_toMulEquiv (f : R ≃+* S) : ⇑(f : R ≃* S) = f :=
   rfl
 #align ring_equiv.coe_to_mul_equiv RingEquiv.coe_toMulEquiv
+-/
 
+#print RingEquiv.coe_toAddEquiv /-
 @[simp, norm_cast]
 theorem coe_toAddEquiv (f : R ≃+* S) : ⇑(f : R ≃+ S) = f :=
   rfl
 #align ring_equiv.coe_to_add_equiv RingEquiv.coe_toAddEquiv
+-/
 
+#print RingEquiv.ringEquivOfUnique /-
 /-- The `ring_equiv` between two semirings with a unique element. -/
 def ringEquivOfUnique {M N} [Unique M] [Unique N] [Add M] [Mul M] [Add N] [Mul N] : M ≃+* N :=
   { AddEquiv.addEquivOfUnique, MulEquiv.mulEquivOfUnique with }
 #align ring_equiv.ring_equiv_of_unique RingEquiv.ringEquivOfUnique
+-/
 
 instance {M N} [Unique M] [Unique N] [Add M] [Mul M] [Add N] [Mul N] : Unique (M ≃+* N)
     where
@@ -217,11 +250,13 @@ instance {M N} [Unique M] [Unique N] [Add M] [Mul M] [Add N] [Mul N] : Unique (M
 
 variable (R)
 
+#print RingEquiv.refl /-
 /-- The identity map is a ring isomorphism. -/
 @[refl]
 protected def refl : R ≃+* R :=
   { MulEquiv.refl R, AddEquiv.refl R with }
 #align ring_equiv.refl RingEquiv.refl
+-/
 
 #print RingEquiv.refl_apply /-
 @[simp]
@@ -230,59 +265,78 @@ theorem refl_apply (x : R) : RingEquiv.refl R x = x :=
 #align ring_equiv.refl_apply RingEquiv.refl_apply
 -/
 
+#print RingEquiv.coe_addEquiv_refl /-
 @[simp]
 theorem coe_addEquiv_refl : (RingEquiv.refl R : R ≃+ R) = AddEquiv.refl R :=
   rfl
 #align ring_equiv.coe_add_equiv_refl RingEquiv.coe_addEquiv_refl
+-/
 
+#print RingEquiv.coe_mulEquiv_refl /-
 @[simp]
 theorem coe_mulEquiv_refl : (RingEquiv.refl R : R ≃* R) = MulEquiv.refl R :=
   rfl
 #align ring_equiv.coe_mul_equiv_refl RingEquiv.coe_mulEquiv_refl
+-/
 
 instance : Inhabited (R ≃+* R) :=
   ⟨RingEquiv.refl R⟩
 
 variable {R}
 
+#print RingEquiv.symm /-
 /-- The inverse of a ring isomorphism is a ring isomorphism. -/
 @[symm]
 protected def symm (e : R ≃+* S) : S ≃+* R :=
   { e.toMulEquiv.symm, e.toAddEquiv.symm with }
 #align ring_equiv.symm RingEquiv.symm
+-/
 
+#print RingEquiv.Simps.symm_apply /-
 /-- See Note [custom simps projection] -/
 def Simps.symm_apply (e : R ≃+* S) : S → R :=
   e.symm
 #align ring_equiv.simps.symm_apply RingEquiv.Simps.symm_apply
+-/
 
 initialize_simps_projections RingEquiv (toFun → apply, invFun → symm_apply)
 
+#print RingEquiv.invFun_eq_symm /-
 @[simp]
 theorem invFun_eq_symm (f : R ≃+* S) : f.invFun = f.symm :=
   rfl
 #align ring_equiv.inv_fun_eq_symm RingEquiv.invFun_eq_symm
+-/
 
+#print RingEquiv.symm_symm /-
 @[simp]
 theorem symm_symm (e : R ≃+* S) : e.symm.symm = e :=
   ext fun x => rfl
 #align ring_equiv.symm_symm RingEquiv.symm_symm
+-/
 
+#print RingEquiv.coe_toEquiv_symm /-
 @[simp]
 theorem coe_toEquiv_symm (e : R ≃+* S) : (e.symm : S ≃ R) = (e : R ≃ S).symm :=
   rfl
 #align ring_equiv.coe_to_equiv_symm RingEquiv.coe_toEquiv_symm
+-/
 
+#print RingEquiv.symm_bijective /-
 theorem symm_bijective : Function.Bijective (RingEquiv.symm : R ≃+* S → S ≃+* R) :=
   Equiv.bijective ⟨RingEquiv.symm, RingEquiv.symm, symm_symm, symm_symm⟩
 #align ring_equiv.symm_bijective RingEquiv.symm_bijective
+-/
 
+#print RingEquiv.mk_coe' /-
 @[simp]
 theorem mk_coe' (e : R ≃+* S) (f h₁ h₂ h₃ h₄) :
     (RingEquiv.mk f (⇑e) h₁ h₂ h₃ h₄ : S ≃+* R) = e.symm :=
   symm_bijective.Injective <| ext fun x => rfl
 #align ring_equiv.mk_coe' RingEquiv.mk_coe'
+-/
 
+#print RingEquiv.symm_mk /-
 @[simp]
 theorem symm_mk (f : R → S) (g h₁ h₂ h₃ h₄) :
     (mk f g h₁ h₂ h₃ h₄).symm =
@@ -291,69 +345,96 @@ theorem symm_mk (f : R → S) (g h₁ h₂ h₃ h₄) :
         invFun := f } :=
   rfl
 #align ring_equiv.symm_mk RingEquiv.symm_mk
+-/
 
+#print RingEquiv.trans /-
 /-- Transitivity of `ring_equiv`. -/
 @[trans]
 protected def trans (e₁ : R ≃+* S) (e₂ : S ≃+* S') : R ≃+* S' :=
   { e₁.toMulEquiv.trans e₂.toMulEquiv, e₁.toAddEquiv.trans e₂.toAddEquiv with }
 #align ring_equiv.trans RingEquiv.trans
+-/
 
+#print RingEquiv.trans_apply /-
 theorem trans_apply (e₁ : R ≃+* S) (e₂ : S ≃+* S') (a : R) : e₁.trans e₂ a = e₂ (e₁ a) :=
   rfl
 #align ring_equiv.trans_apply RingEquiv.trans_apply
+-/
 
+#print RingEquiv.coe_trans /-
 @[simp]
 theorem coe_trans (e₁ : R ≃+* S) (e₂ : S ≃+* S') : (e₁.trans e₂ : R → S') = e₂ ∘ e₁ :=
   rfl
 #align ring_equiv.coe_trans RingEquiv.coe_trans
+-/
 
+#print RingEquiv.symm_trans_apply /-
 @[simp]
 theorem symm_trans_apply (e₁ : R ≃+* S) (e₂ : S ≃+* S') (a : S') :
     (e₁.trans e₂).symm a = e₁.symm (e₂.symm a) :=
   rfl
 #align ring_equiv.symm_trans_apply RingEquiv.symm_trans_apply
+-/
 
+#print RingEquiv.symm_trans /-
 theorem symm_trans (e₁ : R ≃+* S) (e₂ : S ≃+* S') : (e₁.trans e₂).symm = e₂.symm.trans e₁.symm :=
   rfl
 #align ring_equiv.symm_trans RingEquiv.symm_trans
+-/
 
+#print RingEquiv.bijective /-
 protected theorem bijective (e : R ≃+* S) : Function.Bijective e :=
   EquivLike.bijective e
 #align ring_equiv.bijective RingEquiv.bijective
+-/
 
+#print RingEquiv.injective /-
 protected theorem injective (e : R ≃+* S) : Function.Injective e :=
   EquivLike.injective e
 #align ring_equiv.injective RingEquiv.injective
+-/
 
+#print RingEquiv.surjective /-
 protected theorem surjective (e : R ≃+* S) : Function.Surjective e :=
   EquivLike.surjective e
 #align ring_equiv.surjective RingEquiv.surjective
+-/
 
+#print RingEquiv.apply_symm_apply /-
 @[simp]
 theorem apply_symm_apply (e : R ≃+* S) : ∀ x, e (e.symm x) = x :=
   e.toEquiv.apply_symm_apply
 #align ring_equiv.apply_symm_apply RingEquiv.apply_symm_apply
+-/
 
+#print RingEquiv.symm_apply_apply /-
 @[simp]
 theorem symm_apply_apply (e : R ≃+* S) : ∀ x, e.symm (e x) = x :=
   e.toEquiv.symm_apply_apply
 #align ring_equiv.symm_apply_apply RingEquiv.symm_apply_apply
+-/
 
+#print RingEquiv.image_eq_preimage /-
 theorem image_eq_preimage (e : R ≃+* S) (s : Set R) : e '' s = e.symm ⁻¹' s :=
   e.toEquiv.image_eq_preimage s
 #align ring_equiv.image_eq_preimage RingEquiv.image_eq_preimage
+-/
 
+#print RingEquiv.coe_mulEquiv_trans /-
 @[simp]
 theorem coe_mulEquiv_trans (e₁ : R ≃+* S) (e₂ : S ≃+* S') :
     (e₁.trans e₂ : R ≃* S') = (e₁ : R ≃* S).trans ↑e₂ :=
   rfl
 #align ring_equiv.coe_mul_equiv_trans RingEquiv.coe_mulEquiv_trans
+-/
 
+#print RingEquiv.coe_addEquiv_trans /-
 @[simp]
 theorem coe_addEquiv_trans (e₁ : R ≃+* S) (e₂ : S ≃+* S') :
     (e₁.trans e₂ : R ≃+ S') = (e₁ : R ≃+ S).trans ↑e₂ :=
   rfl
 #align ring_equiv.coe_add_equiv_trans RingEquiv.coe_addEquiv_trans
+-/
 
 end Basic
 
@@ -361,6 +442,7 @@ section Opposite
 
 open MulOpposite
 
+#print RingEquiv.op /-
 /-- A ring iso `α ≃+* β` can equivalently be viewed as a ring iso `αᵐᵒᵖ ≃+* βᵐᵒᵖ`. -/
 @[simps]
 protected def op {α β} [Add α] [Mul α] [Add β] [Mul β] : α ≃+* β ≃ (αᵐᵒᵖ ≃+* βᵐᵒᵖ)
@@ -370,23 +452,28 @@ protected def op {α β} [Add α] [Mul α] [Add β] [Mul β] : α ≃+* β ≃ (
   left_inv f := by ext; rfl
   right_inv f := by ext; rfl
 #align ring_equiv.op RingEquiv.op
+-/
 
+#print RingEquiv.unop /-
 /-- The 'unopposite' of a ring iso `αᵐᵒᵖ ≃+* βᵐᵒᵖ`. Inverse to `ring_equiv.op`. -/
 @[simp]
 protected def unop {α β} [Add α] [Mul α] [Add β] [Mul β] : αᵐᵒᵖ ≃+* βᵐᵒᵖ ≃ (α ≃+* β) :=
   RingEquiv.op.symm
 #align ring_equiv.unop RingEquiv.unop
+-/
 
 section NonUnitalCommSemiring
 
 variable (R) [NonUnitalCommSemiring R]
 
+#print RingEquiv.toOpposite /-
 /-- A non-unital commutative ring is isomorphic to its opposite. -/
 def toOpposite : R ≃+* Rᵐᵒᵖ :=
   { MulOpposite.opEquiv with
     map_add' := fun x y => rfl
     map_mul' := fun x y => mul_comm (op y) (op x) }
 #align ring_equiv.to_opposite RingEquiv.toOpposite
+-/
 
 #print RingEquiv.toOpposite_apply /-
 @[simp]
@@ -410,21 +497,28 @@ section NonUnitalSemiring
 
 variable [NonUnitalNonAssocSemiring R] [NonUnitalNonAssocSemiring S] (f : R ≃+* S) (x y : R)
 
+#print RingEquiv.map_zero /-
 /-- A ring isomorphism sends zero to zero. -/
 protected theorem map_zero : f 0 = 0 :=
   map_zero f
 #align ring_equiv.map_zero RingEquiv.map_zero
+-/
 
 variable {x}
 
+#print RingEquiv.map_eq_zero_iff /-
 protected theorem map_eq_zero_iff : f x = 0 ↔ x = 0 :=
   AddEquivClass.map_eq_zero_iff f
 #align ring_equiv.map_eq_zero_iff RingEquiv.map_eq_zero_iff
+-/
 
+#print RingEquiv.map_ne_zero_iff /-
 theorem map_ne_zero_iff : f x ≠ 0 ↔ x ≠ 0 :=
   AddEquivClass.map_ne_zero_iff f
 #align ring_equiv.map_ne_zero_iff RingEquiv.map_ne_zero_iff
+-/
 
+#print RingEquiv.ofBijective /-
 /-- Produce a ring isomorphism from a bijective ring homomorphism. -/
 noncomputable def ofBijective [NonUnitalRingHomClass F R S] (f : F) (hf : Function.Bijective f) :
     R ≃+* S :=
@@ -432,18 +526,24 @@ noncomputable def ofBijective [NonUnitalRingHomClass F R S] (f : F) (hf : Functi
     map_mul' := map_mul f
     map_add' := map_add f }
 #align ring_equiv.of_bijective RingEquiv.ofBijective
+-/
 
+#print RingEquiv.coe_ofBijective /-
 @[simp]
 theorem coe_ofBijective [NonUnitalRingHomClass F R S] (f : F) (hf : Function.Bijective f) :
     (ofBijective f hf : R → S) = f :=
   rfl
 #align ring_equiv.coe_of_bijective RingEquiv.coe_ofBijective
+-/
 
+#print RingEquiv.ofBijective_apply /-
 theorem ofBijective_apply [NonUnitalRingHomClass F R S] (f : F) (hf : Function.Bijective f)
     (x : R) : ofBijective f hf x = f x :=
   rfl
 #align ring_equiv.of_bijective_apply RingEquiv.ofBijective_apply
+-/
 
+#print RingEquiv.piCongrRight /-
 /-- A family of ring isomorphisms `Π j, (R j ≃+* S j)` generates a
 ring isomorphisms between `Π j, R j` and `Π j, S j`.
 
@@ -459,20 +559,26 @@ def piCongrRight {ι : Type _} {R S : ι → Type _} [∀ i, NonUnitalNonAssocSe
     toFun := fun x j => e j (x j)
     invFun := fun x j => (e j).symm (x j) }
 #align ring_equiv.Pi_congr_right RingEquiv.piCongrRight
+-/
 
+#print RingEquiv.piCongrRight_refl /-
 @[simp]
 theorem piCongrRight_refl {ι : Type _} {R : ι → Type _} [∀ i, NonUnitalNonAssocSemiring (R i)] :
     (piCongrRight fun i => RingEquiv.refl (R i)) = RingEquiv.refl _ :=
   rfl
 #align ring_equiv.Pi_congr_right_refl RingEquiv.piCongrRight_refl
+-/
 
+#print RingEquiv.piCongrRight_symm /-
 @[simp]
 theorem piCongrRight_symm {ι : Type _} {R S : ι → Type _} [∀ i, NonUnitalNonAssocSemiring (R i)]
     [∀ i, NonUnitalNonAssocSemiring (S i)] (e : ∀ i, R i ≃+* S i) :
     (piCongrRight e).symm = piCongrRight fun i => (e i).symm :=
   rfl
 #align ring_equiv.Pi_congr_right_symm RingEquiv.piCongrRight_symm
+-/
 
+#print RingEquiv.piCongrRight_trans /-
 @[simp]
 theorem piCongrRight_trans {ι : Type _} {R S T : ι → Type _} [∀ i, NonUnitalNonAssocSemiring (R i)]
     [∀ i, NonUnitalNonAssocSemiring (S i)] [∀ i, NonUnitalNonAssocSemiring (T i)]
@@ -480,6 +586,7 @@ theorem piCongrRight_trans {ι : Type _} {R S T : ι → Type _} [∀ i, NonUnit
     (piCongrRight e).trans (piCongrRight f) = piCongrRight fun i => (e i).trans (f i) :=
   rfl
 #align ring_equiv.Pi_congr_right_trans RingEquiv.piCongrRight_trans
+-/
 
 end NonUnitalSemiring
 
@@ -487,70 +594,92 @@ section Semiring
 
 variable [NonAssocSemiring R] [NonAssocSemiring S] (f : R ≃+* S) (x y : R)
 
+#print RingEquiv.map_one /-
 /-- A ring isomorphism sends one to one. -/
 protected theorem map_one : f 1 = 1 :=
   map_one f
 #align ring_equiv.map_one RingEquiv.map_one
+-/
 
 variable {x}
 
+#print RingEquiv.map_eq_one_iff /-
 protected theorem map_eq_one_iff : f x = 1 ↔ x = 1 :=
   MulEquivClass.map_eq_one_iff f
 #align ring_equiv.map_eq_one_iff RingEquiv.map_eq_one_iff
+-/
 
+#print RingEquiv.map_ne_one_iff /-
 theorem map_ne_one_iff : f x ≠ 1 ↔ x ≠ 1 :=
   MulEquivClass.map_ne_one_iff f
 #align ring_equiv.map_ne_one_iff RingEquiv.map_ne_one_iff
+-/
 
+#print RingEquiv.coe_monoidHom_refl /-
 theorem coe_monoidHom_refl : (RingEquiv.refl R : R →* R) = MonoidHom.id R :=
   rfl
 #align ring_equiv.coe_monoid_hom_refl RingEquiv.coe_monoidHom_refl
+-/
 
+#print RingEquiv.coe_addMonoidHom_refl /-
 @[simp]
 theorem coe_addMonoidHom_refl : (RingEquiv.refl R : R →+ R) = AddMonoidHom.id R :=
   rfl
 #align ring_equiv.coe_add_monoid_hom_refl RingEquiv.coe_addMonoidHom_refl
+-/
 
 /-! `ring_equiv.coe_mul_equiv_refl` and `ring_equiv.coe_add_equiv_refl` are proved above
 in higher generality -/
 
 
+#print RingEquiv.coe_ringHom_refl /-
 @[simp]
 theorem coe_ringHom_refl : (RingEquiv.refl R : R →* R) = RingHom.id R :=
   rfl
 #align ring_equiv.coe_ring_hom_refl RingEquiv.coe_ringHom_refl
+-/
 
+#print RingEquiv.coe_monoidHom_trans /-
 @[simp]
 theorem coe_monoidHom_trans [NonAssocSemiring S'] (e₁ : R ≃+* S) (e₂ : S ≃+* S') :
     (e₁.trans e₂ : R →* S') = (e₂ : S →* S').comp ↑e₁ :=
   rfl
 #align ring_equiv.coe_monoid_hom_trans RingEquiv.coe_monoidHom_trans
+-/
 
+#print RingEquiv.coe_addMonoidHom_trans /-
 @[simp]
 theorem coe_addMonoidHom_trans [NonAssocSemiring S'] (e₁ : R ≃+* S) (e₂ : S ≃+* S') :
     (e₁.trans e₂ : R →+ S') = (e₂ : S →+ S').comp ↑e₁ :=
   rfl
 #align ring_equiv.coe_add_monoid_hom_trans RingEquiv.coe_addMonoidHom_trans
+-/
 
 /-! `ring_equiv.coe_mul_equiv_trans` and `ring_equiv.coe_add_equiv_trans` are proved above
 in higher generality -/
 
 
+#print RingEquiv.coe_ringHom_trans /-
 @[simp]
 theorem coe_ringHom_trans [NonAssocSemiring S'] (e₁ : R ≃+* S) (e₂ : S ≃+* S') :
     (e₁.trans e₂ : R →+* S') = (e₂ : S →+* S').comp ↑e₁ :=
   rfl
 #align ring_equiv.coe_ring_hom_trans RingEquiv.coe_ringHom_trans
+-/
 
+#print RingEquiv.comp_symm /-
 @[simp]
 theorem comp_symm (e : R ≃+* S) : (e : R →+* S).comp (e.symm : S →+* R) = RingHom.id S :=
   RingHom.ext e.apply_symm_apply
 #align ring_equiv.comp_symm RingEquiv.comp_symm
+-/
 
+#print RingEquiv.symm_comp /-
 @[simp]
 theorem symm_comp (e : R ≃+* S) : (e.symm : S →+* R).comp (e : R →+* S) = RingHom.id R :=
   RingHom.ext e.symm_apply_apply
 #align ring_equiv.symm_comp RingEquiv.symm_comp
+-/
 
 end Semiring
 
@@ -558,13 +687,17 @@ section NonUnitalRing
 
 variable [NonUnitalNonAssocRing R] [NonUnitalNonAssocRing S] (f : R ≃+* S) (x y : R)
 
+#print RingEquiv.map_neg /-
 protected theorem map_neg : f (-x) = -f x :=
   map_neg f x
 #align ring_equiv.map_neg RingEquiv.map_neg
+-/
 
+#print RingEquiv.map_sub /-
 protected theorem map_sub : f (x - y) = f x - f y :=
   map_sub f x y
 #align ring_equiv.map_sub RingEquiv.map_sub
+-/
 
 end NonUnitalRing
 
@@ -572,14 +705,18 @@ section Ring
 
 variable [NonAssocRing R] [NonAssocRing S] (f : R ≃+* S) (x y : R)
 
+#print RingEquiv.map_neg_one /-
 @[simp]
 theorem map_neg_one : f (-1) = -1 :=
   f.map_one ▸ f.map_neg 1
 #align ring_equiv.map_neg_one RingEquiv.map_neg_one
+-/
 
+#print RingEquiv.map_eq_neg_one_iff /-
 theorem map_eq_neg_one_iff {x : R} : f x = -1 ↔ x = -1 := by
   rw [← neg_eq_iff_eq_neg, ← neg_eq_iff_eq_neg, ← map_neg, RingEquiv.map_eq_one_iff]
 #align ring_equiv.map_eq_neg_one_iff RingEquiv.map_eq_neg_one_iff
+-/
 
 end Ring
 
@@ -587,35 +724,47 @@ section NonUnitalSemiringHom
 
 variable [NonUnitalNonAssocSemiring R] [NonUnitalNonAssocSemiring S] [NonUnitalNonAssocSemiring S']
 
+#print RingEquiv.toNonUnitalRingHom /-
 /-- Reinterpret a ring equivalence as a non-unital ring homomorphism. -/
 def toNonUnitalRingHom (e : R ≃+* S) : R →ₙ+* S :=
   { e.toMulEquiv.toMulHom, e.toAddEquiv.toAddMonoidHom with }
 #align ring_equiv.to_non_unital_ring_hom RingEquiv.toNonUnitalRingHom
+-/
 
+#print RingEquiv.toNonUnitalRingHom_injective /-
 theorem toNonUnitalRingHom_injective :
     Function.Injective (toNonUnitalRingHom : R ≃+* S → R →ₙ+* S) := fun f g h =>
   RingEquiv.ext (NonUnitalRingHom.ext_iff.1 h)
 #align ring_equiv.to_non_unital_ring_hom_injective RingEquiv.toNonUnitalRingHom_injective
+-/
 
+#print RingEquiv.instCoeToNonUnitalRingHom /-
 /- The instance priority is lowered here so that in the case when `R` and `S` are both unital, Lean
 will first find and use `ring_equiv.has_coe_to_ring_hom`. -/
 instance (priority := 900) instCoeToNonUnitalRingHom : Coe (R ≃+* S) (R →ₙ+* S) :=
   ⟨RingEquiv.toNonUnitalRingHom⟩
 #align ring_equiv.has_coe_to_non_unital_ring_hom RingEquiv.instCoeToNonUnitalRingHom
+-/
 
+#print RingEquiv.toNonUnitalRingHom_eq_coe /-
 theorem toNonUnitalRingHom_eq_coe (f : R ≃+* S) : f.toNonUnitalRingHom = ↑f :=
   rfl
 #align ring_equiv.to_non_unital_ring_hom_eq_coe RingEquiv.toNonUnitalRingHom_eq_coe
+-/
 
+#print RingEquiv.coe_toNonUnitalRingHom /-
 @[simp, norm_cast]
 theorem coe_toNonUnitalRingHom (f : R ≃+* S) : ⇑(f : R →ₙ+* S) = f :=
   rfl
 #align ring_equiv.coe_to_non_unital_ring_hom RingEquiv.coe_toNonUnitalRingHom
+-/
 
+#print RingEquiv.coe_nonUnitalRingHom_inj_iff /-
 theorem coe_nonUnitalRingHom_inj_iff {R S : Type _} [NonUnitalNonAssocSemiring R]
     [NonUnitalNonAssocSemiring S] (f g : R ≃+* S) : f = g ↔ (f : R →ₙ+* S) = g :=
   ⟨congr_arg _, fun h => ext <| NonUnitalRingHom.ext_iff.mp h⟩
 #align ring_equiv.coe_non_unital_ring_hom_inj_iff RingEquiv.coe_nonUnitalRingHom_inj_iff
+-/
 
 #print RingEquiv.toNonUnitalRingHom_refl /-
 @[simp]
@@ -624,33 +773,43 @@ theorem toNonUnitalRingHom_refl : (RingEquiv.refl R).toNonUnitalRingHom = NonUni
 #align ring_equiv.to_non_unital_ring_hom_refl RingEquiv.toNonUnitalRingHom_refl
 -/
 
+#print RingEquiv.toNonUnitalRingHom_apply_symm_toNonUnitalRingHom_apply /-
 @[simp]
 theorem toNonUnitalRingHom_apply_symm_toNonUnitalRingHom_apply (e : R ≃+* S) :
     ∀ y : S, e.toNonUnitalRingHom (e.symm.toNonUnitalRingHom y) = y :=
   e.toEquiv.apply_symm_apply
 #align ring_equiv.to_non_unital_ring_hom_apply_symm_to_non_unital_ring_hom_apply RingEquiv.toNonUnitalRingHom_apply_symm_toNonUnitalRingHom_apply
+-/
 
+#print RingEquiv.symm_toNonUnitalRingHom_apply_toNonUnitalRingHom_apply /-
 @[simp]
 theorem symm_toNonUnitalRingHom_apply_toNonUnitalRingHom_apply (e : R ≃+* S) :
     ∀ x : R, e.symm.toNonUnitalRingHom (e.toNonUnitalRingHom x) = x :=
   Equiv.symm_apply_apply e.toEquiv
 #align ring_equiv.symm_to_non_unital_ring_hom_apply_to_non_unital_ring_hom_apply RingEquiv.symm_toNonUnitalRingHom_apply_toNonUnitalRingHom_apply
+-/
 
+#print RingEquiv.toNonUnitalRingHom_trans /-
 @[simp]
 theorem toNonUnitalRingHom_trans (e₁ : R ≃+* S) (e₂ : S ≃+* S') :
     (e₁.trans e₂).toNonUnitalRingHom = e₂.toNonUnitalRingHom.comp e₁.toNonUnitalRingHom :=
   rfl
 #align ring_equiv.to_non_unital_ring_hom_trans RingEquiv.toNonUnitalRingHom_trans
+-/
 
+#print RingEquiv.toNonUnitalRingHomm_comp_symm_toNonUnitalRingHom /-
 @[simp]
 theorem toNonUnitalRingHomm_comp_symm_toNonUnitalRingHom (e : R ≃+* S) :
     e.toNonUnitalRingHom.comp e.symm.toNonUnitalRingHom = NonUnitalRingHom.id _ := by ext; simp
 #align ring_equiv.to_non_unital_ring_hom_comp_symm_to_non_unital_ring_hom RingEquiv.toNonUnitalRingHomm_comp_symm_toNonUnitalRingHom
+-/
 
+#print RingEquiv.symm_toNonUnitalRingHom_comp_toNonUnitalRingHom /-
 @[simp]
 theorem symm_toNonUnitalRingHom_comp_toNonUnitalRingHom (e : R ≃+* S) :
     e.symm.toNonUnitalRingHom.comp e.toNonUnitalRingHom = NonUnitalRingHom.id _ := by ext; simp
 #align ring_equiv.symm_to_non_unital_ring_hom_comp_to_non_unital_ring_hom RingEquiv.symm_toNonUnitalRingHom_comp_toNonUnitalRingHom
+-/
 
 end NonUnitalSemiringHom
 
@@ -658,64 +817,88 @@ section SemiringHom
 
 variable [NonAssocSemiring R] [NonAssocSemiring S] [NonAssocSemiring S']
 
+#print RingEquiv.toRingHom /-
 /-- Reinterpret a ring equivalence as a ring homomorphism. -/
 def toRingHom (e : R ≃+* S) : R →+* S :=
   { e.toMulEquiv.toMonoidHom, e.toAddEquiv.toAddMonoidHom with }
 #align ring_equiv.to_ring_hom RingEquiv.toRingHom
+-/
 
+#print RingEquiv.toRingHom_injective /-
 theorem toRingHom_injective : Function.Injective (toRingHom : R ≃+* S → R →+* S) := fun f g h =>
   RingEquiv.ext (RingHom.ext_iff.1 h)
 #align ring_equiv.to_ring_hom_injective RingEquiv.toRingHom_injective
+-/
 
+#print RingEquiv.instCoeToRingHom /-
 instance instCoeToRingHom : Coe (R ≃+* S) (R →+* S) :=
   ⟨RingEquiv.toRingHom⟩
 #align ring_equiv.has_coe_to_ring_hom RingEquiv.instCoeToRingHom
+-/
 
+#print RingEquiv.toRingHom_eq_coe /-
 theorem toRingHom_eq_coe (f : R ≃+* S) : f.toRingHom = ↑f :=
   rfl
 #align ring_equiv.to_ring_hom_eq_coe RingEquiv.toRingHom_eq_coe
+-/
 
+#print RingEquiv.coe_toRingHom /-
 @[simp, norm_cast]
 theorem coe_toRingHom (f : R ≃+* S) : ⇑(f : R →+* S) = f :=
   rfl
 #align ring_equiv.coe_to_ring_hom RingEquiv.coe_toRingHom
+-/
 
+#print RingEquiv.coe_ringHom_inj_iff /-
 theorem coe_ringHom_inj_iff {R S : Type _} [NonAssocSemiring R] [NonAssocSemiring S]
     (f g : R ≃+* S) : f = g ↔ (f : R →+* S) = g :=
   ⟨congr_arg _, fun h => ext <| RingHom.ext_iff.mp h⟩
 #align ring_equiv.coe_ring_hom_inj_iff RingEquiv.coe_ringHom_inj_iff
+-/
 
+#print RingEquiv.toNonUnitalRingHom_commutes /-
 /-- The two paths coercion can take to a `non_unital_ring_hom` are equivalent -/
 @[simp, norm_cast]
 theorem toNonUnitalRingHom_commutes (f : R ≃+* S) : ((f : R →+* S) : R →ₙ+* S) = (f : R →ₙ+* S) :=
   rfl
 #align ring_equiv.to_non_unital_ring_hom_commutes RingEquiv.toNonUnitalRingHom_commutes
+-/
 
+#print RingEquiv.toMonoidHom /-
 /-- Reinterpret a ring equivalence as a monoid homomorphism. -/
 abbrev toMonoidHom (e : R ≃+* S) : R →* S :=
   e.toRingHom.toMonoidHom
 #align ring_equiv.to_monoid_hom RingEquiv.toMonoidHom
+-/
 
+#print RingEquiv.toAddMonoidHom /-
 /-- Reinterpret a ring equivalence as an `add_monoid` homomorphism. -/
 abbrev toAddMonoidHom (e : R ≃+* S) : R →+ S :=
   e.toRingHom.toAddMonoidHom
 #align ring_equiv.to_add_monoid_hom RingEquiv.toAddMonoidHom
+-/
 
+#print RingEquiv.toAddMonoidMom_commutes /-
 /-- The two paths coercion can take to an `add_monoid_hom` are equivalent -/
 theorem toAddMonoidMom_commutes (f : R ≃+* S) :
     (f : R →+* S).toAddMonoidHom = (f : R ≃+ S).toAddMonoidHom :=
   rfl
 #align ring_equiv.to_add_monoid_hom_commutes RingEquiv.toAddMonoidMom_commutes
+-/
 
+#print RingEquiv.toMonoidHom_commutes /-
 /-- The two paths coercion can take to an `monoid_hom` are equivalent -/
 theorem toMonoidHom_commutes (f : R ≃+* S) : (f : R →+* S).toMonoidHom = (f : R ≃* S).toMonoidHom :=
   rfl
 #align ring_equiv.to_monoid_hom_commutes RingEquiv.toMonoidHom_commutes
+-/
 
+#print RingEquiv.toEquiv_commutes /-
 /-- The two paths coercion can take to an `equiv` are equivalent -/
 theorem toEquiv_commutes (f : R ≃+* S) : (f : R ≃+ S).toEquiv = (f : R ≃* S).toEquiv :=
   rfl
 #align ring_equiv.to_equiv_commutes RingEquiv.toEquiv_commutes
+-/
 
 #print RingEquiv.toRingHom_refl /-
 @[simp]
@@ -738,34 +921,45 @@ theorem toAddMonoidHom_refl : (RingEquiv.refl R).toAddMonoidHom = AddMonoidHom.i
 #align ring_equiv.to_add_monoid_hom_refl RingEquiv.toAddMonoidHom_refl
 -/
 
+#print RingEquiv.toRingHom_apply_symm_toRingHom_apply /-
 @[simp]
 theorem toRingHom_apply_symm_toRingHom_apply (e : R ≃+* S) :
     ∀ y : S, e.toRingHom (e.symm.toRingHom y) = y :=
   e.toEquiv.apply_symm_apply
 #align ring_equiv.to_ring_hom_apply_symm_to_ring_hom_apply RingEquiv.toRingHom_apply_symm_toRingHom_apply
+-/
 
+#print RingEquiv.symm_toRingHom_apply_toRingHom_apply /-
 @[simp]
 theorem symm_toRingHom_apply_toRingHom_apply (e : R ≃+* S) :
     ∀ x : R, e.symm.toRingHom (e.toRingHom x) = x :=
   Equiv.symm_apply_apply e.toEquiv
 #align ring_equiv.symm_to_ring_hom_apply_to_ring_hom_apply RingEquiv.symm_toRingHom_apply_toRingHom_apply
+-/
 
+#print RingEquiv.toRingHom_trans /-
 @[simp]
 theorem toRingHom_trans (e₁ : R ≃+* S) (e₂ : S ≃+* S') :
     (e₁.trans e₂).toRingHom = e₂.toRingHom.comp e₁.toRingHom :=
   rfl
 #align ring_equiv.to_ring_hom_trans RingEquiv.toRingHom_trans
+-/
 
+#print RingEquiv.toRingHom_comp_symm_toRingHom /-
 @[simp]
 theorem toRingHom_comp_symm_toRingHom (e : R ≃+* S) :
     e.toRingHom.comp e.symm.toRingHom = RingHom.id _ := by ext; simp
 #align ring_equiv.to_ring_hom_comp_symm_to_ring_hom RingEquiv.toRingHom_comp_symm_toRingHom
+-/
 
+#print RingEquiv.symm_toRingHom_comp_toRingHom /-
 @[simp]
 theorem symm_toRingHom_comp_toRingHom (e : R ≃+* S) :
     e.symm.toRingHom.comp e.toRingHom = RingHom.id _ := by ext; simp
 #align ring_equiv.symm_to_ring_hom_comp_to_ring_hom RingEquiv.symm_toRingHom_comp_toRingHom
+-/
 
+#print RingEquiv.ofHomInv' /-
 /-- Construct an equivalence of rings from homomorphisms in both directions, which are inverses.
 -/
 @[simps]
@@ -781,7 +975,9 @@ def ofHomInv' {R S F G : Type _} [NonUnitalNonAssocSemiring R] [NonUnitalNonAsso
   map_mul' := map_mul hom
   map_add' := map_add hom
 #align ring_equiv.of_hom_inv' RingEquiv.ofHomInv'
+-/
 
+#print RingEquiv.ofHomInv /-
 /--
 Construct an equivalence of rings from unital homomorphisms in both directions, which are inverses.
 -/
@@ -798,6 +994,7 @@ def ofHomInv {R S F G : Type _} [NonAssocSemiring R] [NonAssocSemiring S] [RingH
   map_mul' := map_mul hom
   map_add' := map_add hom
 #align ring_equiv.of_hom_inv RingEquiv.ofHomInv
+-/
 
 end SemiringHom
 
@@ -805,9 +1002,11 @@ section GroupPower
 
 variable [Semiring R] [Semiring S]
 
+#print RingEquiv.map_pow /-
 protected theorem map_pow (f : R ≃+* S) (a) : ∀ n : ℕ, f (a ^ n) = f a ^ n :=
   map_pow f a
 #align ring_equiv.map_pow RingEquiv.map_pow
+-/
 
 end GroupPower
 
@@ -815,21 +1014,25 @@ end RingEquiv
 
 namespace MulEquiv
 
+#print MulEquiv.toRingEquiv /-
 /-- Gives a `ring_equiv` from an element of a `mul_equiv_class` preserving addition.-/
 def toRingEquiv {R S F : Type _} [Add R] [Add S] [Mul R] [Mul S] [MulEquivClass F R S] (f : F)
     (H : ∀ x y : R, f (x + y) = f x + f y) : R ≃+* S :=
   { (f : R ≃* S).toEquiv, (f : R ≃* S), AddEquiv.mk' (f : R ≃* S).toEquiv H with }
 #align mul_equiv.to_ring_equiv MulEquiv.toRingEquiv
+-/
 
 end MulEquiv
 
 namespace AddEquiv
 
+#print AddEquiv.toRingEquiv /-
 /-- Gives a `ring_equiv` from an element of an `add_equiv_class` preserving addition.-/
 def toRingEquiv {R S F : Type _} [Add R] [Add S] [Mul R] [Mul S] [AddEquivClass F R S] (f : F)
     (H : ∀ x y : R, f (x * y) = f x * f y) : R ≃+* S :=
   { (f : R ≃+ S).toEquiv, (f : R ≃+ S), MulEquiv.mk' (f : R ≃+ S).toEquiv H with }
 #align add_equiv.to_ring_equiv AddEquiv.toRingEquiv
+-/
 
 end AddEquiv
 
@@ -837,16 +1040,21 @@ namespace RingEquiv
 
 variable [Add R] [Add S] [Mul R] [Mul S]
 
+#print RingEquiv.self_trans_symm /-
 @[simp]
 theorem self_trans_symm (e : R ≃+* S) : e.trans e.symm = RingEquiv.refl R :=
   ext e.3
 #align ring_equiv.self_trans_symm RingEquiv.self_trans_symm
+-/
 
+#print RingEquiv.symm_trans_self /-
 @[simp]
 theorem symm_trans_self (e : R ≃+* S) : e.symm.trans e = RingEquiv.refl S :=
   ext e.4
 #align ring_equiv.symm_trans_self RingEquiv.symm_trans_self
+-/
 
+#print RingEquiv.noZeroDivisors /-
 /-- If two rings are isomorphic, and the second doesn't have zero divisors,
 then so does the first. -/
 protected theorem noZeroDivisors {A : Type _} (B : Type _) [Ring A] [Ring B] [NoZeroDivisors B]
@@ -857,7 +1065,9 @@ protected theorem noZeroDivisors {A : Type _} (B : Type _) [Ring A] [Ring B] [No
       have : e x * e y = 0 := by rw [← e.map_mul, hxy, e.map_zero]
       simpa using eq_zero_or_eq_zero_of_mul_eq_zero this }
 #align ring_equiv.no_zero_divisors RingEquiv.noZeroDivisors
+-/
 
+#print RingEquiv.isDomain /-
 /-- If two rings are isomorphic, and the second is a domain, then so is the first. -/
 protected theorem isDomain {A : Type _} (B : Type _) [Ring A] [Ring B] [IsDomain B] (e : A ≃+* B) :
     IsDomain A :=
@@ -866,6 +1076,7 @@ protected theorem isDomain {A : Type _} (B : Type _) [Ring A] [Ring B] [IsDomain
   haveI := e.no_zero_divisors B
   exact NoZeroDivisors.to_isDomain _
 #align ring_equiv.is_domain RingEquiv.isDomain
+-/
 
 end RingEquiv
 

mathlib commit https://github.com/leanprover-community/mathlib/commit/cca40788df1b8755d5baf17ab2f27dacc2e17acb

@@ -68,7 +68,7 @@ add_decl_doc RingEquiv.toMulEquiv
 /-- `ring_equiv_class F R S` states that `F` is a type of ring structure preserving equivalences.
 You should extend this class when you extend `ring_equiv`. -/
 class RingEquivClass (F : Type _) (R S : outParam (Type _)) [Mul R] [Add R] [Mul S] [Add S] extends
-  MulEquivClass F R S where
+    MulEquivClass F R S where
   map_add : ∀ (f : F) (a b), f (a + b) = f a + f b
 #align ring_equiv_class RingEquivClass
 -/

mathlib commit https://github.com/leanprover-community/mathlib/commit/cca40788df1b8755d5baf17ab2f27dacc2e17acb

@@ -136,12 +136,10 @@ theorem toEquiv_eq_coe (f : R ≃+* S) : f.toEquiv = f :=
   rfl
 #align ring_equiv.to_equiv_eq_coe RingEquiv.toEquiv_eq_coe
 
-/- warning: ring_equiv.to_fun_eq_coe clashes with [anonymous] -> [anonymous]
-Case conversion may be inaccurate. Consider using '#align ring_equiv.to_fun_eq_coe [anonymous]ₓ'. -/
 @[simp]
-theorem [anonymous] (f : R ≃+* S) : f.toFun = f :=
+theorem toFun_eq_coe (f : R ≃+* S) : f.toFun = f :=
   rfl
-#align ring_equiv.to_fun_eq_coe [anonymous]
+#align ring_equiv.to_fun_eq_coe RingEquiv.toFun_eq_coe
 
 @[simp]
 theorem coe_toEquiv (f : R ≃+* S) : ⇑(f : R ≃ S) = f :=

mathlib commit https://github.com/leanprover-community/mathlib/commit/917c3c072e487b3cccdbfeff17e75b40e45f66cb

@@ -47,12 +47,6 @@ equiv, mul_equiv, add_equiv, ring_equiv, mul_aut, add_aut, ring_aut
 
 variable {F α β R S S' : Type _}
 
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 /-- An equivalence between two (non-unital non-associative semi)rings that preserves the
 algebraic structure. -/
 structure RingEquiv (R S : Type _) [Mul R] [Add R] [Mul S] [Add S] extends R ≃ S, R ≃* S, R ≃+ S
@@ -89,12 +83,6 @@ instance (priority := 100) toAddEquivClass (F R S : Type _) [Mul R] [Add R] [Mul
 #align ring_equiv_class.to_add_equiv_class RingEquivClass.toAddEquivClass
 -/
 
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 -- See note [lower instance priority]
 instance (priority := 100) toRingHomClass (F R S : Type _) [NonAssocSemiring R] [NonAssocSemiring S]
     [h : RingEquivClass F R S] : RingHomClass F R S :=
@@ -105,12 +93,6 @@ instance (priority := 100) toRingHomClass (F R S : Type _) [NonAssocSemiring R]
     map_one := map_one }
 #align ring_equiv_class.to_ring_hom_class RingEquivClass.toRingHomClass
 
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 -- See note [lower instance priority]
 instance (priority := 100) toNonUnitalRingHomClass (F R S : Type _) [NonUnitalNonAssocSemiring R]
     [NonUnitalNonAssocSemiring S] [h : RingEquivClass F R S] : NonUnitalRingHomClass F R S :=
@@ -149,59 +131,33 @@ instance : RingEquivClass (R ≃+* S) R S where
 instance : CoeFun (R ≃+* S) fun _ => R → S :=
   ⟨RingEquiv.toFun⟩
 
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 @[simp]
 theorem toEquiv_eq_coe (f : R ≃+* S) : f.toEquiv = f :=
   rfl
 #align ring_equiv.to_equiv_eq_coe RingEquiv.toEquiv_eq_coe
 
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 @[simp]
 theorem [anonymous] (f : R ≃+* S) : f.toFun = f :=
   rfl
 #align ring_equiv.to_fun_eq_coe [anonymous]
 
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 @[simp]
 theorem coe_toEquiv (f : R ≃+* S) : ⇑(f : R ≃ S) = f :=
   rfl
 #align ring_equiv.coe_to_equiv RingEquiv.coe_toEquiv
 
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 /-- A ring isomorphism preserves multiplication. -/
 protected theorem map_mul (e : R ≃+* S) (x y : R) : e (x * y) = e x * e y :=
   map_mul e x y
 #align ring_equiv.map_mul RingEquiv.map_mul
 
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 /-- A ring isomorphism preserves addition. -/
 protected theorem map_add (e : R ≃+* S) (x y : R) : e (x + y) = e x + e y :=
   map_add e x y
 #align ring_equiv.map_add RingEquiv.map_add
 
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 /-- Two ring isomorphisms agree if they are defined by the
     same underlying function. -/
 @[ext]
@@ -214,85 +170,43 @@ theorem coe_mk (e e' h₁ h₂ h₃ h₄) : ⇑(⟨e, e', h₁, h₂, h₃, h₄
   rfl
 #align ring_equiv.coe_mk RingEquiv.coe_mkₓ
 
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 @[simp]
 theorem mk_coe (e : R ≃+* S) (e' h₁ h₂ h₃ h₄) : (⟨e, e', h₁, h₂, h₃, h₄⟩ : R ≃+* S) = e :=
   ext fun _ => rfl
 #align ring_equiv.mk_coe RingEquiv.mk_coe
 
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 protected theorem congr_arg {f : R ≃+* S} {x x' : R} : x = x' → f x = f x' :=
   FunLike.congr_arg f
 #align ring_equiv.congr_arg RingEquiv.congr_arg
 
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 protected theorem congr_fun {f g : R ≃+* S} (h : f = g) (x : R) : f x = g x :=
   FunLike.congr_fun h x
 #align ring_equiv.congr_fun RingEquiv.congr_fun
 
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 protected theorem ext_iff {f g : R ≃+* S} : f = g ↔ ∀ x, f x = g x :=
   FunLike.ext_iff
 #align ring_equiv.ext_iff RingEquiv.ext_iff
 
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 @[simp]
 theorem toAddEquiv_eq_coe (f : R ≃+* S) : f.toAddEquiv = ↑f :=
   rfl
 #align ring_equiv.to_add_equiv_eq_coe RingEquiv.toAddEquiv_eq_coe
 
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 @[simp]
 theorem toMulEquiv_eq_coe (f : R ≃+* S) : f.toMulEquiv = ↑f :=
   rfl
 #align ring_equiv.to_mul_equiv_eq_coe RingEquiv.toMulEquiv_eq_coe
 
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 @[simp, norm_cast]
 theorem coe_toMulEquiv (f : R ≃+* S) : ⇑(f : R ≃* S) = f :=
   rfl
 #align ring_equiv.coe_to_mul_equiv RingEquiv.coe_toMulEquiv
 
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 @[simp, norm_cast]
 theorem coe_toAddEquiv (f : R ≃+* S) : ⇑(f : R ≃+ S) = f :=
   rfl
 #align ring_equiv.coe_to_add_equiv RingEquiv.coe_toAddEquiv
 
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 /-- The `ring_equiv` between two semirings with a unique element. -/
 def ringEquivOfUnique {M N} [Unique M] [Unique N] [Add M] [Mul M] [Add N] [Mul N] : M ≃+* N :=
   { AddEquiv.addEquivOfUnique, MulEquiv.mulEquivOfUnique with }
@@ -305,12 +219,6 @@ instance {M N} [Unique M] [Unique N] [Add M] [Mul M] [Add N] [Mul N] : Unique (M
 
 variable (R)
 
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 /-- The identity map is a ring isomorphism. -/
 @[refl]
 protected def refl : R ≃+* R :=
@@ -324,23 +232,11 @@ theorem refl_apply (x : R) : RingEquiv.refl R x = x :=
 #align ring_equiv.refl_apply RingEquiv.refl_apply
 -/
 
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 @[simp]
 theorem coe_addEquiv_refl : (RingEquiv.refl R : R ≃+ R) = AddEquiv.refl R :=
   rfl
 #align ring_equiv.coe_add_equiv_refl RingEquiv.coe_addEquiv_refl
 
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 @[simp]
 theorem coe_mulEquiv_refl : (RingEquiv.refl R : R ≃* R) = MulEquiv.refl R :=
   rfl
@@ -351,24 +247,12 @@ instance : Inhabited (R ≃+* R) :=
 
 variable {R}
 
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 /-- The inverse of a ring isomorphism is a ring isomorphism. -/
 @[symm]
 protected def symm (e : R ≃+* S) : S ≃+* R :=
   { e.toMulEquiv.symm, e.toAddEquiv.symm with }
 #align ring_equiv.symm RingEquiv.symm
 
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 /-- See Note [custom simps projection] -/
 def Simps.symm_apply (e : R ≃+* S) : S → R :=
   e.symm
@@ -376,61 +260,31 @@ def Simps.symm_apply (e : R ≃+* S) : S → R :=
 
 initialize_simps_projections RingEquiv (toFun → apply, invFun → symm_apply)
 
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 @[simp]
 theorem invFun_eq_symm (f : R ≃+* S) : f.invFun = f.symm :=
   rfl
 #align ring_equiv.inv_fun_eq_symm RingEquiv.invFun_eq_symm
 
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 @[simp]
 theorem symm_symm (e : R ≃+* S) : e.symm.symm = e :=
   ext fun x => rfl
 #align ring_equiv.symm_symm RingEquiv.symm_symm
 
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 @[simp]
 theorem coe_toEquiv_symm (e : R ≃+* S) : (e.symm : S ≃ R) = (e : R ≃ S).symm :=
   rfl
 #align ring_equiv.coe_to_equiv_symm RingEquiv.coe_toEquiv_symm
 
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 theorem symm_bijective : Function.Bijective (RingEquiv.symm : R ≃+* S → S ≃+* R) :=
   Equiv.bijective ⟨RingEquiv.symm, RingEquiv.symm, symm_symm, symm_symm⟩
 #align ring_equiv.symm_bijective RingEquiv.symm_bijective
 
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 @[simp]
 theorem mk_coe' (e : R ≃+* S) (f h₁ h₂ h₃ h₄) :
     (RingEquiv.mk f (⇑e) h₁ h₂ h₃ h₄ : S ≃+* R) = e.symm :=
   symm_bijective.Injective <| ext fun x => rfl
 #align ring_equiv.mk_coe' RingEquiv.mk_coe'
 
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 @[simp]
 theorem symm_mk (f : R → S) (g h₁ h₂ h₃ h₄) :
     (mk f g h₁ h₂ h₃ h₄).symm =
@@ -440,117 +294,63 @@ theorem symm_mk (f : R → S) (g h₁ h₂ h₃ h₄) :
   rfl
 #align ring_equiv.symm_mk RingEquiv.symm_mk
 
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 /-- Transitivity of `ring_equiv`. -/
 @[trans]
 protected def trans (e₁ : R ≃+* S) (e₂ : S ≃+* S') : R ≃+* S' :=
   { e₁.toMulEquiv.trans e₂.toMulEquiv, e₁.toAddEquiv.trans e₂.toAddEquiv with }
 #align ring_equiv.trans RingEquiv.trans
 
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 theorem trans_apply (e₁ : R ≃+* S) (e₂ : S ≃+* S') (a : R) : e₁.trans e₂ a = e₂ (e₁ a) :=
   rfl
 #align ring_equiv.trans_apply RingEquiv.trans_apply
 
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 @[simp]
 theorem coe_trans (e₁ : R ≃+* S) (e₂ : S ≃+* S') : (e₁.trans e₂ : R → S') = e₂ ∘ e₁ :=
   rfl
 #align ring_equiv.coe_trans RingEquiv.coe_trans
 
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 @[simp]
 theorem symm_trans_apply (e₁ : R ≃+* S) (e₂ : S ≃+* S') (a : S') :
     (e₁.trans e₂).symm a = e₁.symm (e₂.symm a) :=
   rfl
 #align ring_equiv.symm_trans_apply RingEquiv.symm_trans_apply
 
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 theorem symm_trans (e₁ : R ≃+* S) (e₂ : S ≃+* S') : (e₁.trans e₂).symm = e₂.symm.trans e₁.symm :=
   rfl
 #align ring_equiv.symm_trans RingEquiv.symm_trans
 
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 protected theorem bijective (e : R ≃+* S) : Function.Bijective e :=
   EquivLike.bijective e
 #align ring_equiv.bijective RingEquiv.bijective
 
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 protected theorem injective (e : R ≃+* S) : Function.Injective e :=
   EquivLike.injective e
 #align ring_equiv.injective RingEquiv.injective
 
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 protected theorem surjective (e : R ≃+* S) : Function.Surjective e :=
   EquivLike.surjective e
 #align ring_equiv.surjective RingEquiv.surjective
 
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 @[simp]
 theorem apply_symm_apply (e : R ≃+* S) : ∀ x, e (e.symm x) = x :=
   e.toEquiv.apply_symm_apply
 #align ring_equiv.apply_symm_apply RingEquiv.apply_symm_apply
 
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 @[simp]
 theorem symm_apply_apply (e : R ≃+* S) : ∀ x, e.symm (e x) = x :=
   e.toEquiv.symm_apply_apply
 #align ring_equiv.symm_apply_apply RingEquiv.symm_apply_apply
 
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 theorem image_eq_preimage (e : R ≃+* S) (s : Set R) : e '' s = e.symm ⁻¹' s :=
   e.toEquiv.image_eq_preimage s
 #align ring_equiv.image_eq_preimage RingEquiv.image_eq_preimage
 
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 @[simp]
 theorem coe_mulEquiv_trans (e₁ : R ≃+* S) (e₂ : S ≃+* S') :
     (e₁.trans e₂ : R ≃* S') = (e₁ : R ≃* S).trans ↑e₂ :=
   rfl
 #align ring_equiv.coe_mul_equiv_trans RingEquiv.coe_mulEquiv_trans
 
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 @[simp]
 theorem coe_addEquiv_trans (e₁ : R ≃+* S) (e₂ : S ≃+* S') :
     (e₁.trans e₂ : R ≃+ S') = (e₁ : R ≃+ S).trans ↑e₂ :=
@@ -563,12 +363,6 @@ section Opposite
 
 open MulOpposite
 
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 /-- A ring iso `α ≃+* β` can equivalently be viewed as a ring iso `αᵐᵒᵖ ≃+* βᵐᵒᵖ`. -/
 @[simps]
 protected def op {α β} [Add α] [Mul α] [Add β] [Mul β] : α ≃+* β ≃ (αᵐᵒᵖ ≃+* βᵐᵒᵖ)
@@ -579,12 +373,6 @@ protected def op {α β} [Add α] [Mul α] [Add β] [Mul β] : α ≃+* β ≃ (
   right_inv f := by ext; rfl
 #align ring_equiv.op RingEquiv.op
 
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 /-- The 'unopposite' of a ring iso `αᵐᵒᵖ ≃+* βᵐᵒᵖ`. Inverse to `ring_equiv.op`. -/
 @[simp]
 protected def unop {α β} [Add α] [Mul α] [Add β] [Mul β] : αᵐᵒᵖ ≃+* βᵐᵒᵖ ≃ (α ≃+* β) :=
@@ -595,12 +383,6 @@ section NonUnitalCommSemiring
 
 variable (R) [NonUnitalCommSemiring R]
 
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 /-- A non-unital commutative ring is isomorphic to its opposite. -/
 def toOpposite : R ≃+* Rᵐᵒᵖ :=
   { MulOpposite.opEquiv with
@@ -630,12 +412,6 @@ section NonUnitalSemiring
 
 variable [NonUnitalNonAssocSemiring R] [NonUnitalNonAssocSemiring S] (f : R ≃+* S) (x y : R)
 
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 /-- A ring isomorphism sends zero to zero. -/
 protected theorem map_zero : f 0 = 0 :=
   map_zero f
@@ -643,32 +419,14 @@ protected theorem map_zero : f 0 = 0 :=
 
 variable {x}
 
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 protected theorem map_eq_zero_iff : f x = 0 ↔ x = 0 :=
   AddEquivClass.map_eq_zero_iff f
 #align ring_equiv.map_eq_zero_iff RingEquiv.map_eq_zero_iff
 
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 theorem map_ne_zero_iff : f x ≠ 0 ↔ x ≠ 0 :=
   AddEquivClass.map_ne_zero_iff f
 #align ring_equiv.map_ne_zero_iff RingEquiv.map_ne_zero_iff
 
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 /-- Produce a ring isomorphism from a bijective ring homomorphism. -/
 noncomputable def ofBijective [NonUnitalRingHomClass F R S] (f : F) (hf : Function.Bijective f) :
     R ≃+* S :=
@@ -677,32 +435,17 @@ noncomputable def ofBijective [NonUnitalRingHomClass F R S] (f : F) (hf : Functi
     map_add' := map_add f }
 #align ring_equiv.of_bijective RingEquiv.ofBijective
 
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 @[simp]
 theorem coe_ofBijective [NonUnitalRingHomClass F R S] (f : F) (hf : Function.Bijective f) :
     (ofBijective f hf : R → S) = f :=
   rfl
 #align ring_equiv.coe_of_bijective RingEquiv.coe_ofBijective
 
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 theorem ofBijective_apply [NonUnitalRingHomClass F R S] (f : F) (hf : Function.Bijective f)
     (x : R) : ofBijective f hf x = f x :=
   rfl
 #align ring_equiv.of_bijective_apply RingEquiv.ofBijective_apply
 
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 /-- A family of ring isomorphisms `Π j, (R j ≃+* S j)` generates a
 ring isomorphisms between `Π j, R j` and `Π j, S j`.
 
@@ -719,24 +462,12 @@ def piCongrRight {ι : Type _} {R S : ι → Type _} [∀ i, NonUnitalNonAssocSe
     invFun := fun x j => (e j).symm (x j) }
 #align ring_equiv.Pi_congr_right RingEquiv.piCongrRight
 
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 @[simp]
 theorem piCongrRight_refl {ι : Type _} {R : ι → Type _} [∀ i, NonUnitalNonAssocSemiring (R i)] :
     (piCongrRight fun i => RingEquiv.refl (R i)) = RingEquiv.refl _ :=
   rfl
 #align ring_equiv.Pi_congr_right_refl RingEquiv.piCongrRight_refl
 
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 @[simp]
 theorem piCongrRight_symm {ι : Type _} {R S : ι → Type _} [∀ i, NonUnitalNonAssocSemiring (R i)]
     [∀ i, NonUnitalNonAssocSemiring (S i)] (e : ∀ i, R i ≃+* S i) :
@@ -744,12 +475,6 @@ theorem piCongrRight_symm {ι : Type _} {R S : ι → Type _} [∀ i, NonUnitalN
   rfl
 #align ring_equiv.Pi_congr_right_symm RingEquiv.piCongrRight_symm
 
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 @[simp]
 theorem piCongrRight_trans {ι : Type _} {R S T : ι → Type _} [∀ i, NonUnitalNonAssocSemiring (R i)]
     [∀ i, NonUnitalNonAssocSemiring (S i)] [∀ i, NonUnitalNonAssocSemiring (T i)]
@@ -764,12 +489,6 @@ section Semiring
 
 variable [NonAssocSemiring R] [NonAssocSemiring S] (f : R ≃+* S) (x y : R)
 
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 /-- A ring isomorphism sends one to one. -/
 protected theorem map_one : f 1 = 1 :=
   map_one f
@@ -777,33 +496,18 @@ protected theorem map_one : f 1 = 1 :=
 
 variable {x}
 
-/- warning: ring_equiv.map_eq_one_iff -> RingEquiv.map_eq_one_iff is a dubious translation:
-<too large>
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 protected theorem map_eq_one_iff : f x = 1 ↔ x = 1 :=
   MulEquivClass.map_eq_one_iff f
 #align ring_equiv.map_eq_one_iff RingEquiv.map_eq_one_iff
 
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 theorem map_ne_one_iff : f x ≠ 1 ↔ x ≠ 1 :=
   MulEquivClass.map_ne_one_iff f
 #align ring_equiv.map_ne_one_iff RingEquiv.map_ne_one_iff
 
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 theorem coe_monoidHom_refl : (RingEquiv.refl R : R →* R) = MonoidHom.id R :=
   rfl
 #align ring_equiv.coe_monoid_hom_refl RingEquiv.coe_monoidHom_refl
 
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 @[simp]
 theorem coe_addMonoidHom_refl : (RingEquiv.refl R : R →+ R) = AddMonoidHom.id R :=
   rfl
@@ -813,29 +517,17 @@ theorem coe_addMonoidHom_refl : (RingEquiv.refl R : R →+ R) = AddMonoidHom.id
 in higher generality -/
 
 
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 @[simp]
 theorem coe_ringHom_refl : (RingEquiv.refl R : R →* R) = RingHom.id R :=
   rfl
 #align ring_equiv.coe_ring_hom_refl RingEquiv.coe_ringHom_refl
 
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-<too large>
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 @[simp]
 theorem coe_monoidHom_trans [NonAssocSemiring S'] (e₁ : R ≃+* S) (e₂ : S ≃+* S') :
     (e₁.trans e₂ : R →* S') = (e₂ : S →* S').comp ↑e₁ :=
   rfl
 #align ring_equiv.coe_monoid_hom_trans RingEquiv.coe_monoidHom_trans
 
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 @[simp]
 theorem coe_addMonoidHom_trans [NonAssocSemiring S'] (e₁ : R ≃+* S) (e₂ : S ≃+* S') :
     (e₁.trans e₂ : R →+ S') = (e₂ : S →+ S').comp ↑e₁ :=
@@ -846,26 +538,17 @@ theorem coe_addMonoidHom_trans [NonAssocSemiring S'] (e₁ : R ≃+* S) (e₂ :
 in higher generality -/
 
 
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 @[simp]
 theorem coe_ringHom_trans [NonAssocSemiring S'] (e₁ : R ≃+* S) (e₂ : S ≃+* S') :
     (e₁.trans e₂ : R →+* S') = (e₂ : S →+* S').comp ↑e₁ :=
   rfl
 #align ring_equiv.coe_ring_hom_trans RingEquiv.coe_ringHom_trans
 
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 @[simp]
 theorem comp_symm (e : R ≃+* S) : (e : R →+* S).comp (e.symm : S →+* R) = RingHom.id S :=
   RingHom.ext e.apply_symm_apply
 #align ring_equiv.comp_symm RingEquiv.comp_symm
 
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 @[simp]
 theorem symm_comp (e : R ≃+* S) : (e.symm : S →+* R).comp (e : R →+* S) = RingHom.id R :=
   RingHom.ext e.symm_apply_apply
@@ -877,16 +560,10 @@ section NonUnitalRing
 
 variable [NonUnitalNonAssocRing R] [NonUnitalNonAssocRing S] (f : R ≃+* S) (x y : R)
 
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 protected theorem map_neg : f (-x) = -f x :=
   map_neg f x
 #align ring_equiv.map_neg RingEquiv.map_neg
 
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 protected theorem map_sub : f (x - y) = f x - f y :=
   map_sub f x y
 #align ring_equiv.map_sub RingEquiv.map_sub
@@ -897,17 +574,11 @@ section Ring
 
 variable [NonAssocRing R] [NonAssocRing S] (f : R ≃+* S) (x y : R)
 
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 @[simp]
 theorem map_neg_one : f (-1) = -1 :=
   f.map_one ▸ f.map_neg 1
 #align ring_equiv.map_neg_one RingEquiv.map_neg_one
 
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 theorem map_eq_neg_one_iff {x : R} : f x = -1 ↔ x = -1 := by
   rw [← neg_eq_iff_eq_neg, ← neg_eq_iff_eq_neg, ← map_neg, RingEquiv.map_eq_one_iff]
 #align ring_equiv.map_eq_neg_one_iff RingEquiv.map_eq_neg_one_iff
@@ -918,67 +589,31 @@ section NonUnitalSemiringHom
 
 variable [NonUnitalNonAssocSemiring R] [NonUnitalNonAssocSemiring S] [NonUnitalNonAssocSemiring S']
 
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 /-- Reinterpret a ring equivalence as a non-unital ring homomorphism. -/
 def toNonUnitalRingHom (e : R ≃+* S) : R →ₙ+* S :=
   { e.toMulEquiv.toMulHom, e.toAddEquiv.toAddMonoidHom with }
 #align ring_equiv.to_non_unital_ring_hom RingEquiv.toNonUnitalRingHom
 
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 theorem toNonUnitalRingHom_injective :
     Function.Injective (toNonUnitalRingHom : R ≃+* S → R →ₙ+* S) := fun f g h =>
   RingEquiv.ext (NonUnitalRingHom.ext_iff.1 h)
 #align ring_equiv.to_non_unital_ring_hom_injective RingEquiv.toNonUnitalRingHom_injective
 
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 /- The instance priority is lowered here so that in the case when `R` and `S` are both unital, Lean
 will first find and use `ring_equiv.has_coe_to_ring_hom`. -/
 instance (priority := 900) instCoeToNonUnitalRingHom : Coe (R ≃+* S) (R →ₙ+* S) :=
   ⟨RingEquiv.toNonUnitalRingHom⟩
 #align ring_equiv.has_coe_to_non_unital_ring_hom RingEquiv.instCoeToNonUnitalRingHom
 
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 theorem toNonUnitalRingHom_eq_coe (f : R ≃+* S) : f.toNonUnitalRingHom = ↑f :=
   rfl
 #align ring_equiv.to_non_unital_ring_hom_eq_coe RingEquiv.toNonUnitalRingHom_eq_coe
 
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 @[simp, norm_cast]
 theorem coe_toNonUnitalRingHom (f : R ≃+* S) : ⇑(f : R →ₙ+* S) = f :=
   rfl
 #align ring_equiv.coe_to_non_unital_ring_hom RingEquiv.coe_toNonUnitalRingHom
 
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 theorem coe_nonUnitalRingHom_inj_iff {R S : Type _} [NonUnitalNonAssocSemiring R]
     [NonUnitalNonAssocSemiring S] (f g : R ≃+* S) : f = g ↔ (f : R →ₙ+* S) = g :=
   ⟨congr_arg _, fun h => ext <| NonUnitalRingHom.ext_iff.mp h⟩
@@ -991,59 +626,29 @@ theorem toNonUnitalRingHom_refl : (RingEquiv.refl R).toNonUnitalRingHom = NonUni
 #align ring_equiv.to_non_unital_ring_hom_refl RingEquiv.toNonUnitalRingHom_refl
 -/
 
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 @[simp]
 theorem toNonUnitalRingHom_apply_symm_toNonUnitalRingHom_apply (e : R ≃+* S) :
     ∀ y : S, e.toNonUnitalRingHom (e.symm.toNonUnitalRingHom y) = y :=
   e.toEquiv.apply_symm_apply
 #align ring_equiv.to_non_unital_ring_hom_apply_symm_to_non_unital_ring_hom_apply RingEquiv.toNonUnitalRingHom_apply_symm_toNonUnitalRingHom_apply
 
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 @[simp]
 theorem symm_toNonUnitalRingHom_apply_toNonUnitalRingHom_apply (e : R ≃+* S) :
     ∀ x : R, e.symm.toNonUnitalRingHom (e.toNonUnitalRingHom x) = x :=
   Equiv.symm_apply_apply e.toEquiv
 #align ring_equiv.symm_to_non_unital_ring_hom_apply_to_non_unital_ring_hom_apply RingEquiv.symm_toNonUnitalRingHom_apply_toNonUnitalRingHom_apply
 
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 @[simp]
 theorem toNonUnitalRingHom_trans (e₁ : R ≃+* S) (e₂ : S ≃+* S') :
     (e₁.trans e₂).toNonUnitalRingHom = e₂.toNonUnitalRingHom.comp e₁.toNonUnitalRingHom :=
   rfl
 #align ring_equiv.to_non_unital_ring_hom_trans RingEquiv.toNonUnitalRingHom_trans
 
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 @[simp]
 theorem toNonUnitalRingHomm_comp_symm_toNonUnitalRingHom (e : R ≃+* S) :
     e.toNonUnitalRingHom.comp e.symm.toNonUnitalRingHom = NonUnitalRingHom.id _ := by ext; simp
 #align ring_equiv.to_non_unital_ring_hom_comp_symm_to_non_unital_ring_hom RingEquiv.toNonUnitalRingHomm_comp_symm_toNonUnitalRingHom
 
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 @[simp]
 theorem symm_toNonUnitalRingHom_comp_toNonUnitalRingHom (e : R ≃+* S) :
     e.symm.toNonUnitalRingHom.comp e.toNonUnitalRingHom = NonUnitalRingHom.id _ := by ext; simp
@@ -1055,114 +660,60 @@ section SemiringHom
 
 variable [NonAssocSemiring R] [NonAssocSemiring S] [NonAssocSemiring S']
 
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 /-- Reinterpret a ring equivalence as a ring homomorphism. -/
 def toRingHom (e : R ≃+* S) : R →+* S :=
   { e.toMulEquiv.toMonoidHom, e.toAddEquiv.toAddMonoidHom with }
 #align ring_equiv.to_ring_hom RingEquiv.toRingHom
 
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 theorem toRingHom_injective : Function.Injective (toRingHom : R ≃+* S → R →+* S) := fun f g h =>
   RingEquiv.ext (RingHom.ext_iff.1 h)
 #align ring_equiv.to_ring_hom_injective RingEquiv.toRingHom_injective
 
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 instance instCoeToRingHom : Coe (R ≃+* S) (R →+* S) :=
   ⟨RingEquiv.toRingHom⟩
 #align ring_equiv.has_coe_to_ring_hom RingEquiv.instCoeToRingHom
 
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 theorem toRingHom_eq_coe (f : R ≃+* S) : f.toRingHom = ↑f :=
   rfl
 #align ring_equiv.to_ring_hom_eq_coe RingEquiv.toRingHom_eq_coe
 
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 @[simp, norm_cast]
 theorem coe_toRingHom (f : R ≃+* S) : ⇑(f : R →+* S) = f :=
   rfl
 #align ring_equiv.coe_to_ring_hom RingEquiv.coe_toRingHom
 
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 theorem coe_ringHom_inj_iff {R S : Type _} [NonAssocSemiring R] [NonAssocSemiring S]
     (f g : R ≃+* S) : f = g ↔ (f : R →+* S) = g :=
   ⟨congr_arg _, fun h => ext <| RingHom.ext_iff.mp h⟩
 #align ring_equiv.coe_ring_hom_inj_iff RingEquiv.coe_ringHom_inj_iff
 
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 /-- The two paths coercion can take to a `non_unital_ring_hom` are equivalent -/
 @[simp, norm_cast]
 theorem toNonUnitalRingHom_commutes (f : R ≃+* S) : ((f : R →+* S) : R →ₙ+* S) = (f : R →ₙ+* S) :=
   rfl
 #align ring_equiv.to_non_unital_ring_hom_commutes RingEquiv.toNonUnitalRingHom_commutes
 
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 /-- Reinterpret a ring equivalence as a monoid homomorphism. -/
 abbrev toMonoidHom (e : R ≃+* S) : R →* S :=
   e.toRingHom.toMonoidHom
 #align ring_equiv.to_monoid_hom RingEquiv.toMonoidHom
 
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 /-- Reinterpret a ring equivalence as an `add_monoid` homomorphism. -/
 abbrev toAddMonoidHom (e : R ≃+* S) : R →+ S :=
   e.toRingHom.toAddMonoidHom
 #align ring_equiv.to_add_monoid_hom RingEquiv.toAddMonoidHom
 
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 /-- The two paths coercion can take to an `add_monoid_hom` are equivalent -/
 theorem toAddMonoidMom_commutes (f : R ≃+* S) :
     (f : R →+* S).toAddMonoidHom = (f : R ≃+ S).toAddMonoidHom :=
   rfl
 #align ring_equiv.to_add_monoid_hom_commutes RingEquiv.toAddMonoidMom_commutes
 
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 /-- The two paths coercion can take to an `monoid_hom` are equivalent -/
 theorem toMonoidHom_commutes (f : R ≃+* S) : (f : R →+* S).toMonoidHom = (f : R ≃* S).toMonoidHom :=
   rfl
 #align ring_equiv.to_monoid_hom_commutes RingEquiv.toMonoidHom_commutes
 
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 /-- The two paths coercion can take to an `equiv` are equivalent -/
 theorem toEquiv_commutes (f : R ≃+* S) : (f : R ≃+ S).toEquiv = (f : R ≃* S).toEquiv :=
   rfl
@@ -1189,70 +740,34 @@ theorem toAddMonoidHom_refl : (RingEquiv.refl R).toAddMonoidHom = AddMonoidHom.i
 #align ring_equiv.to_add_monoid_hom_refl RingEquiv.toAddMonoidHom_refl
 -/
 
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 @[simp]
 theorem toRingHom_apply_symm_toRingHom_apply (e : R ≃+* S) :
     ∀ y : S, e.toRingHom (e.symm.toRingHom y) = y :=
   e.toEquiv.apply_symm_apply
 #align ring_equiv.to_ring_hom_apply_symm_to_ring_hom_apply RingEquiv.toRingHom_apply_symm_toRingHom_apply
 
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 @[simp]
 theorem symm_toRingHom_apply_toRingHom_apply (e : R ≃+* S) :
     ∀ x : R, e.symm.toRingHom (e.toRingHom x) = x :=
   Equiv.symm_apply_apply e.toEquiv
 #align ring_equiv.symm_to_ring_hom_apply_to_ring_hom_apply RingEquiv.symm_toRingHom_apply_toRingHom_apply
 
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 @[simp]
 theorem toRingHom_trans (e₁ : R ≃+* S) (e₂ : S ≃+* S') :
     (e₁.trans e₂).toRingHom = e₂.toRingHom.comp e₁.toRingHom :=
   rfl
 #align ring_equiv.to_ring_hom_trans RingEquiv.toRingHom_trans
 
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 @[simp]
 theorem toRingHom_comp_symm_toRingHom (e : R ≃+* S) :
     e.toRingHom.comp e.symm.toRingHom = RingHom.id _ := by ext; simp
 #align ring_equiv.to_ring_hom_comp_symm_to_ring_hom RingEquiv.toRingHom_comp_symm_toRingHom
 
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 @[simp]
 theorem symm_toRingHom_comp_toRingHom (e : R ≃+* S) :
     e.symm.toRingHom.comp e.toRingHom = RingHom.id _ := by ext; simp
 #align ring_equiv.symm_to_ring_hom_comp_to_ring_hom RingEquiv.symm_toRingHom_comp_toRingHom
 
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 /-- Construct an equivalence of rings from homomorphisms in both directions, which are inverses.
 -/
 @[simps]
@@ -1269,12 +784,6 @@ def ofHomInv' {R S F G : Type _} [NonUnitalNonAssocSemiring R] [NonUnitalNonAsso
   map_add' := map_add hom
 #align ring_equiv.of_hom_inv' RingEquiv.ofHomInv'
 
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 /--
 Construct an equivalence of rings from unital homomorphisms in both directions, which are inverses.
 -/
@@ -1298,9 +807,6 @@ section GroupPower
 
 variable [Semiring R] [Semiring S]
 
-/- warning: ring_equiv.map_pow -> RingEquiv.map_pow is a dubious translation:
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 protected theorem map_pow (f : R ≃+* S) (a) : ∀ n : ℕ, f (a ^ n) = f a ^ n :=
   map_pow f a
 #align ring_equiv.map_pow RingEquiv.map_pow
@@ -1311,12 +817,6 @@ end RingEquiv
 
 namespace MulEquiv
 
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 /-- Gives a `ring_equiv` from an element of a `mul_equiv_class` preserving addition.-/
 def toRingEquiv {R S F : Type _} [Add R] [Add S] [Mul R] [Mul S] [MulEquivClass F R S] (f : F)
     (H : ∀ x y : R, f (x + y) = f x + f y) : R ≃+* S :=
@@ -1327,12 +827,6 @@ end MulEquiv
 
 namespace AddEquiv
 
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 /-- Gives a `ring_equiv` from an element of an `add_equiv_class` preserving addition.-/
 def toRingEquiv {R S F : Type _} [Add R] [Add S] [Mul R] [Mul S] [AddEquivClass F R S] (f : F)
     (H : ∀ x y : R, f (x * y) = f x * f y) : R ≃+* S :=
@@ -1345,34 +839,16 @@ namespace RingEquiv
 
 variable [Add R] [Add S] [Mul R] [Mul S]
 
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 @[simp]
 theorem self_trans_symm (e : R ≃+* S) : e.trans e.symm = RingEquiv.refl R :=
   ext e.3
 #align ring_equiv.self_trans_symm RingEquiv.self_trans_symm
 
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 @[simp]
 theorem symm_trans_self (e : R ≃+* S) : e.symm.trans e = RingEquiv.refl S :=
   ext e.4
 #align ring_equiv.symm_trans_self RingEquiv.symm_trans_self
 
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-Case conversion may be inaccurate. Consider using '#align ring_equiv.no_zero_divisors RingEquiv.noZeroDivisorsₓ'. -/
 /-- If two rings are isomorphic, and the second doesn't have zero divisors,
 then so does the first. -/
 protected theorem noZeroDivisors {A : Type _} (B : Type _) [Ring A] [Ring B] [NoZeroDivisors B]
@@ -1384,12 +860,6 @@ protected theorem noZeroDivisors {A : Type _} (B : Type _) [Ring A] [Ring B] [No
       simpa using eq_zero_or_eq_zero_of_mul_eq_zero this }
 #align ring_equiv.no_zero_divisors RingEquiv.noZeroDivisors
 
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-Case conversion may be inaccurate. Consider using '#align ring_equiv.is_domain RingEquiv.isDomainₓ'. -/
 /-- If two rings are isomorphic, and the second is a domain, then so is the first. -/
 protected theorem isDomain {A : Type _} (B : Type _) [Ring A] [Ring B] [IsDomain B] (e : A ≃+* B) :
     IsDomain A :=

mathlib commit https://github.com/leanprover-community/mathlib/commit/917c3c072e487b3cccdbfeff17e75b40e45f66cb

@@ -140,10 +140,7 @@ variable [Mul R] [Add R] [Mul S] [Add S] [Mul S'] [Add S']
 instance : RingEquivClass (R ≃+* S) R S where
   coe := toFun
   inv := invFun
-  coe_injective' e f h₁ h₂ := by
-    cases e
-    cases f
-    congr
+  coe_injective' e f h₁ h₂ := by cases e; cases f; congr
   map_add := map_add'
   map_mul := map_mul'
   left_inv := RingEquiv.left_inv
@@ -578,12 +575,8 @@ protected def op {α β} [Add α] [Mul α] [Add β] [Mul β] : α ≃+* β ≃ (
     where
   toFun f := { f.toAddEquiv.mulOp, f.toMulEquiv.op with }
   invFun f := { AddEquiv.mulOp.symm f.toAddEquiv, MulEquiv.op.symm f.toMulEquiv with }
-  left_inv f := by
-    ext
-    rfl
-  right_inv f := by
-    ext
-    rfl
+  left_inv f := by ext; rfl
+  right_inv f := by ext; rfl
 #align ring_equiv.op RingEquiv.op
 
 /- warning: ring_equiv.unop -> RingEquiv.unop is a dubious translation:
@@ -1042,10 +1035,7 @@ but is expected to have type
 Case conversion may be inaccurate. Consider using '#align ring_equiv.to_non_unital_ring_hom_comp_symm_to_non_unital_ring_hom RingEquiv.toNonUnitalRingHomm_comp_symm_toNonUnitalRingHomₓ'. -/
 @[simp]
 theorem toNonUnitalRingHomm_comp_symm_toNonUnitalRingHom (e : R ≃+* S) :
-    e.toNonUnitalRingHom.comp e.symm.toNonUnitalRingHom = NonUnitalRingHom.id _ :=
-  by
-  ext
-  simp
+    e.toNonUnitalRingHom.comp e.symm.toNonUnitalRingHom = NonUnitalRingHom.id _ := by ext; simp
 #align ring_equiv.to_non_unital_ring_hom_comp_symm_to_non_unital_ring_hom RingEquiv.toNonUnitalRingHomm_comp_symm_toNonUnitalRingHom
 
 /- warning: ring_equiv.symm_to_non_unital_ring_hom_comp_to_non_unital_ring_hom -> RingEquiv.symm_toNonUnitalRingHom_comp_toNonUnitalRingHom is a dubious translation:
@@ -1056,10 +1046,7 @@ but is expected to have type
 Case conversion may be inaccurate. Consider using '#align ring_equiv.symm_to_non_unital_ring_hom_comp_to_non_unital_ring_hom RingEquiv.symm_toNonUnitalRingHom_comp_toNonUnitalRingHomₓ'. -/
 @[simp]
 theorem symm_toNonUnitalRingHom_comp_toNonUnitalRingHom (e : R ≃+* S) :
-    e.symm.toNonUnitalRingHom.comp e.toNonUnitalRingHom = NonUnitalRingHom.id _ :=
-  by
-  ext
-  simp
+    e.symm.toNonUnitalRingHom.comp e.toNonUnitalRingHom = NonUnitalRingHom.id _ := by ext; simp
 #align ring_equiv.symm_to_non_unital_ring_hom_comp_to_non_unital_ring_hom RingEquiv.symm_toNonUnitalRingHom_comp_toNonUnitalRingHom
 
 end NonUnitalSemiringHom
@@ -1246,10 +1233,7 @@ but is expected to have type
 Case conversion may be inaccurate. Consider using '#align ring_equiv.to_ring_hom_comp_symm_to_ring_hom RingEquiv.toRingHom_comp_symm_toRingHomₓ'. -/
 @[simp]
 theorem toRingHom_comp_symm_toRingHom (e : R ≃+* S) :
-    e.toRingHom.comp e.symm.toRingHom = RingHom.id _ :=
-  by
-  ext
-  simp
+    e.toRingHom.comp e.symm.toRingHom = RingHom.id _ := by ext; simp
 #align ring_equiv.to_ring_hom_comp_symm_to_ring_hom RingEquiv.toRingHom_comp_symm_toRingHom
 
 /- warning: ring_equiv.symm_to_ring_hom_comp_to_ring_hom -> RingEquiv.symm_toRingHom_comp_toRingHom is a dubious translation:
@@ -1260,10 +1244,7 @@ but is expected to have type
 Case conversion may be inaccurate. Consider using '#align ring_equiv.symm_to_ring_hom_comp_to_ring_hom RingEquiv.symm_toRingHom_comp_toRingHomₓ'. -/
 @[simp]
 theorem symm_toRingHom_comp_toRingHom (e : R ≃+* S) :
-    e.symm.toRingHom.comp e.toRingHom = RingHom.id _ :=
-  by
-  ext
-  simp
+    e.symm.toRingHom.comp e.toRingHom = RingHom.id _ := by ext; simp
 #align ring_equiv.symm_to_ring_hom_comp_to_ring_hom RingEquiv.symm_toRingHom_comp_toRingHom
 
 /- warning: ring_equiv.of_hom_inv' -> RingEquiv.ofHomInv' is a dubious translation:

mathlib commit https://github.com/leanprover-community/mathlib/commit/917c3c072e487b3cccdbfeff17e75b40e45f66cb

@@ -187,10 +187,7 @@ theorem coe_toEquiv (f : R ≃+* S) : ⇑(f : R ≃ S) = f :=
 #align ring_equiv.coe_to_equiv RingEquiv.coe_toEquiv
 
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 /-- A ring isomorphism preserves multiplication. -/
 protected theorem map_mul (e : R ≃+* S) (x y : R) : e (x * y) = e x * e y :=
@@ -198,10 +195,7 @@ protected theorem map_mul (e : R ≃+* S) (x y : R) : e (x * y) = e x * e y :=
 #align ring_equiv.map_mul RingEquiv.map_mul
 
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 /-- A ring isomorphism preserves addition. -/
 protected theorem map_add (e : R ≃+* S) (x y : R) : e (x + y) = e x + e y :=
@@ -209,10 +203,7 @@ protected theorem map_add (e : R ≃+* S) (x y : R) : e (x + y) = e x + e y :=
 #align ring_equiv.map_add RingEquiv.map_add
 
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 Case conversion may be inaccurate. Consider using '#align ring_equiv.ext RingEquiv.extₓ'. -/
 /-- Two ring isomorphisms agree if they are defined by the
     same underlying function. -/
@@ -227,10 +218,7 @@ theorem coe_mk (e e' h₁ h₂ h₃ h₄) : ⇑(⟨e, e', h₁, h₂, h₃, h₄
 #align ring_equiv.coe_mk RingEquiv.coe_mkₓ
 
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 Case conversion may be inaccurate. Consider using '#align ring_equiv.mk_coe RingEquiv.mk_coeₓ'. -/
 @[simp]
 theorem mk_coe (e : R ≃+* S) (e' h₁ h₂ h₃ h₄) : (⟨e, e', h₁, h₂, h₃, h₄⟩ : R ≃+* S) = e :=
@@ -238,30 +226,21 @@ theorem mk_coe (e : R ≃+* S) (e' h₁ h₂ h₃ h₄) : (⟨e, e', h₁, h₂,
 #align ring_equiv.mk_coe RingEquiv.mk_coe
 
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 Case conversion may be inaccurate. Consider using '#align ring_equiv.congr_arg RingEquiv.congr_argₓ'. -/
 protected theorem congr_arg {f : R ≃+* S} {x x' : R} : x = x' → f x = f x' :=
   FunLike.congr_arg f
 #align ring_equiv.congr_arg RingEquiv.congr_arg
 
 /- warning: ring_equiv.congr_fun -> RingEquiv.congr_fun is a dubious translation:
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 Case conversion may be inaccurate. Consider using '#align ring_equiv.congr_fun RingEquiv.congr_funₓ'. -/
 protected theorem congr_fun {f g : R ≃+* S} (h : f = g) (x : R) : f x = g x :=
   FunLike.congr_fun h x
 #align ring_equiv.congr_fun RingEquiv.congr_fun
 
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 Case conversion may be inaccurate. Consider using '#align ring_equiv.ext_iff RingEquiv.ext_iffₓ'. -/
 protected theorem ext_iff {f g : R ≃+* S} : f = g ↔ ∀ x, f x = g x :=
   FunLike.ext_iff
@@ -444,10 +423,7 @@ theorem symm_bijective : Function.Bijective (RingEquiv.symm : R ≃+* S → S 
 #align ring_equiv.symm_bijective RingEquiv.symm_bijective
 
 /- warning: ring_equiv.mk_coe' -> RingEquiv.mk_coe' is a dubious translation:
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 Case conversion may be inaccurate. Consider using '#align ring_equiv.mk_coe' RingEquiv.mk_coe'ₓ'. -/
 @[simp]
 theorem mk_coe' (e : R ≃+* S) (f h₁ h₂ h₃ h₄) :
@@ -456,10 +432,7 @@ theorem mk_coe' (e : R ≃+* S) (f h₁ h₂ h₃ h₄) :
 #align ring_equiv.mk_coe' RingEquiv.mk_coe'
 
 /- warning: ring_equiv.symm_mk -> RingEquiv.symm_mk is a dubious translation:
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 Case conversion may be inaccurate. Consider using '#align ring_equiv.symm_mk RingEquiv.symm_mkₓ'. -/
 @[simp]
 theorem symm_mk (f : R → S) (g h₁ h₂ h₃ h₄) :
@@ -483,20 +456,14 @@ protected def trans (e₁ : R ≃+* S) (e₂ : S ≃+* S') : R ≃+* S' :=
 #align ring_equiv.trans RingEquiv.trans
 
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 Case conversion may be inaccurate. Consider using '#align ring_equiv.trans_apply RingEquiv.trans_applyₓ'. -/
 theorem trans_apply (e₁ : R ≃+* S) (e₂ : S ≃+* S') (a : R) : e₁.trans e₂ a = e₂ (e₁ a) :=
   rfl
 #align ring_equiv.trans_apply RingEquiv.trans_apply
 
 /- warning: ring_equiv.coe_trans -> RingEquiv.coe_trans is a dubious translation:
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 Case conversion may be inaccurate. Consider using '#align ring_equiv.coe_trans RingEquiv.coe_transₓ'. -/
 @[simp]
 theorem coe_trans (e₁ : R ≃+* S) (e₂ : S ≃+* S') : (e₁.trans e₂ : R → S') = e₂ ∘ e₁ :=
@@ -504,10 +471,7 @@ theorem coe_trans (e₁ : R ≃+* S) (e₂ : S ≃+* S') : (e₁.trans e₂ : R
 #align ring_equiv.coe_trans RingEquiv.coe_trans
 
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 Case conversion may be inaccurate. Consider using '#align ring_equiv.symm_trans_apply RingEquiv.symm_trans_applyₓ'. -/
 @[simp]
 theorem symm_trans_apply (e₁ : R ≃+* S) (e₂ : S ≃+* S') (a : S') :
@@ -556,10 +520,7 @@ protected theorem surjective (e : R ≃+* S) : Function.Surjective e :=
 #align ring_equiv.surjective RingEquiv.surjective
 
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 Case conversion may be inaccurate. Consider using '#align ring_equiv.apply_symm_apply RingEquiv.apply_symm_applyₓ'. -/
 @[simp]
 theorem apply_symm_apply (e : R ≃+* S) : ∀ x, e (e.symm x) = x :=
@@ -567,10 +528,7 @@ theorem apply_symm_apply (e : R ≃+* S) : ∀ x, e (e.symm x) = x :=
 #align ring_equiv.apply_symm_apply RingEquiv.apply_symm_apply
 
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 Case conversion may be inaccurate. Consider using '#align ring_equiv.symm_apply_apply RingEquiv.symm_apply_applyₓ'. -/
 @[simp]
 theorem symm_apply_apply (e : R ≃+* S) : ∀ x, e.symm (e x) = x :=
@@ -578,20 +536,14 @@ theorem symm_apply_apply (e : R ≃+* S) : ∀ x, e.symm (e x) = x :=
 #align ring_equiv.symm_apply_apply RingEquiv.symm_apply_apply
 
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 Case conversion may be inaccurate. Consider using '#align ring_equiv.image_eq_preimage RingEquiv.image_eq_preimageₓ'. -/
 theorem image_eq_preimage (e : R ≃+* S) (s : Set R) : e '' s = e.symm ⁻¹' s :=
   e.toEquiv.image_eq_preimage s
 #align ring_equiv.image_eq_preimage RingEquiv.image_eq_preimage
 
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 Case conversion may be inaccurate. Consider using '#align ring_equiv.coe_mul_equiv_trans RingEquiv.coe_mulEquiv_transₓ'. -/
 @[simp]
 theorem coe_mulEquiv_trans (e₁ : R ≃+* S) (e₂ : S ≃+* S') :
@@ -600,10 +552,7 @@ theorem coe_mulEquiv_trans (e₁ : R ≃+* S) (e₂ : S ≃+* S') :
 #align ring_equiv.coe_mul_equiv_trans RingEquiv.coe_mulEquiv_trans
 
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 Case conversion may be inaccurate. Consider using '#align ring_equiv.coe_add_equiv_trans RingEquiv.coe_addEquiv_transₓ'. -/
 @[simp]
 theorem coe_addEquiv_trans (e₁ : R ≃+* S) (e₂ : S ≃+* S') :
@@ -748,10 +697,7 @@ theorem coe_ofBijective [NonUnitalRingHomClass F R S] (f : F) (hf : Function.Bij
 #align ring_equiv.coe_of_bijective RingEquiv.coe_ofBijective
 
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 Case conversion may be inaccurate. Consider using '#align ring_equiv.of_bijective_apply RingEquiv.ofBijective_applyₓ'. -/
 theorem ofBijective_apply [NonUnitalRingHomClass F R S] (f : F) (hf : Function.Bijective f)
     (x : R) : ofBijective f hf x = f x :=
@@ -839,20 +785,14 @@ protected theorem map_one : f 1 = 1 :=
 variable {x}
 
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 Case conversion may be inaccurate. Consider using '#align ring_equiv.map_eq_one_iff RingEquiv.map_eq_one_iffₓ'. -/
 protected theorem map_eq_one_iff : f x = 1 ↔ x = 1 :=
   MulEquivClass.map_eq_one_iff f
 #align ring_equiv.map_eq_one_iff RingEquiv.map_eq_one_iff
 
 /- warning: ring_equiv.map_ne_one_iff -> RingEquiv.map_ne_one_iff is a dubious translation:
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+<too large>
 Case conversion may be inaccurate. Consider using '#align ring_equiv.map_ne_one_iff RingEquiv.map_ne_one_iffₓ'. -/
 theorem map_ne_one_iff : f x ≠ 1 ↔ x ≠ 1 :=
   MulEquivClass.map_ne_one_iff f
@@ -869,10 +809,7 @@ theorem coe_monoidHom_refl : (RingEquiv.refl R : R →* R) = MonoidHom.id R :=
 #align ring_equiv.coe_monoid_hom_refl RingEquiv.coe_monoidHom_refl
 
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+<too large>
 Case conversion may be inaccurate. Consider using '#align ring_equiv.coe_add_monoid_hom_refl RingEquiv.coe_addMonoidHom_reflₓ'. -/
 @[simp]
 theorem coe_addMonoidHom_refl : (RingEquiv.refl R : R →+ R) = AddMonoidHom.id R :=
@@ -895,10 +832,7 @@ theorem coe_ringHom_refl : (RingEquiv.refl R : R →* R) = RingHom.id R :=
 #align ring_equiv.coe_ring_hom_refl RingEquiv.coe_ringHom_refl
 
 /- warning: ring_equiv.coe_monoid_hom_trans -> RingEquiv.coe_monoidHom_trans is a dubious translation:
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(NonAssocSemiring.toMulZeroOneClass.{u1} R _inst_1)) (MulZeroOneClass.toMulOneClass.{u2} S (NonAssocSemiring.toMulZeroOneClass.{u2} S _inst_2))) (MonoidHom.hasCoeT.{u1, u2, max u1 u2} R S (RingEquiv.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2))) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2)))) (MulZeroOneClass.toMulOneClass.{u1} R (NonAssocSemiring.toMulZeroOneClass.{u1} R _inst_1)) (MulZeroOneClass.toMulOneClass.{u2} S (NonAssocSemiring.toMulZeroOneClass.{u2} S _inst_2)) (RingHomClass.toMonoidHomClass.{max u1 u2, u1, u2} (RingEquiv.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2))) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2)))) R S _inst_1 _inst_2 (RingEquivClass.toRingHomClass.{max u1 u2, u1, u2} (RingEquiv.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2))) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2)))) R S _inst_1 _inst_2 (RingEquiv.ringEquivClass.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2))) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2))))))))) e₁))
-but is expected to have type
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(NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2))) (Distrib.toAdd.{u3} S' (NonUnitalNonAssocSemiring.toDistrib.{u3} S' (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u3} S' _inst_3)))), Eq.{max (succ u2) (succ u3)} (MonoidHom.{u2, u3} R S' (MulZeroOneClass.toMulOneClass.{u2} R (NonAssocSemiring.toMulZeroOneClass.{u2} R _inst_1)) (MulZeroOneClass.toMulOneClass.{u3} S' (NonAssocSemiring.toMulZeroOneClass.{u3} S' _inst_3))) (MonoidHomClass.toMonoidHom.{u2, u3, max u2 u3} R S' (RingEquiv.{u2, u3} R S' (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u3} S' (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u3} S' _inst_3)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u3} S' (NonUnitalNonAssocSemiring.toDistrib.{u3} S' (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u3} S' _inst_3)))) (MulZeroOneClass.toMulOneClass.{u2} R (NonAssocSemiring.toMulZeroOneClass.{u2} R _inst_1)) (MulZeroOneClass.toMulOneClass.{u3} S' (NonAssocSemiring.toMulZeroOneClass.{u3} S' _inst_3)) (RingHomClass.toMonoidHomClass.{max u2 u3, u2, u3} (RingEquiv.{u2, u3} R S' (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u3} S' (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u3} S' _inst_3)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u3} S' (NonUnitalNonAssocSemiring.toDistrib.{u3} S' (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u3} S' _inst_3)))) R S' _inst_1 _inst_3 (RingEquivClass.toRingHomClass.{max u2 u3, u2, u3} (RingEquiv.{u2, u3} R S' (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u3} S' (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u3} S' _inst_3)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u3} S' (NonUnitalNonAssocSemiring.toDistrib.{u3} S' (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u3} S' _inst_3)))) R S' _inst_1 _inst_3 (RingEquiv.instRingEquivClassRingEquiv.{u2, u3} R S' (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u3} S' (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u3} S' _inst_3)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u3} S' (NonUnitalNonAssocSemiring.toDistrib.{u3} S' (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u3} S' _inst_3)))))) (RingEquiv.trans.{u2, u1, u3} R S S' (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2))) (NonUnitalNonAssocSemiring.toMul.{u3} S' (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u3} S' _inst_3)) (Distrib.toAdd.{u3} S' (NonUnitalNonAssocSemiring.toDistrib.{u3} S' (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u3} S' _inst_3))) e₁ e₂)) (MonoidHom.comp.{u2, u1, u3} R S S' (MulZeroOneClass.toMulOneClass.{u2} R (NonAssocSemiring.toMulZeroOneClass.{u2} R _inst_1)) (MulZeroOneClass.toMulOneClass.{u1} S (NonAssocSemiring.toMulZeroOneClass.{u1} S _inst_2)) (MulZeroOneClass.toMulOneClass.{u3} S' (NonAssocSemiring.toMulZeroOneClass.{u3} S' _inst_3)) (MonoidHomClass.toMonoidHom.{u1, u3, max u1 u3} S S' (RingEquiv.{u1, u3} S S' (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (NonUnitalNonAssocSemiring.toMul.{u3} S' (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u3} S' _inst_3)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2))) (Distrib.toAdd.{u3} S' (NonUnitalNonAssocSemiring.toDistrib.{u3} S' (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u3} S' _inst_3)))) (MulZeroOneClass.toMulOneClass.{u1} S (NonAssocSemiring.toMulZeroOneClass.{u1} S _inst_2)) (MulZeroOneClass.toMulOneClass.{u3} S' (NonAssocSemiring.toMulZeroOneClass.{u3} S' _inst_3)) (RingHomClass.toMonoidHomClass.{max u1 u3, u1, u3} (RingEquiv.{u1, u3} S S' (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (NonUnitalNonAssocSemiring.toMul.{u3} S' (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u3} S' _inst_3)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2))) (Distrib.toAdd.{u3} S' (NonUnitalNonAssocSemiring.toDistrib.{u3} S' (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u3} S' _inst_3)))) S S' _inst_2 _inst_3 (RingEquivClass.toRingHomClass.{max u1 u3, u1, u3} (RingEquiv.{u1, u3} S S' (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (NonUnitalNonAssocSemiring.toMul.{u3} S' (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u3} S' _inst_3)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2))) (Distrib.toAdd.{u3} S' (NonUnitalNonAssocSemiring.toDistrib.{u3} S' (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u3} S' _inst_3)))) S S' _inst_2 _inst_3 (RingEquiv.instRingEquivClassRingEquiv.{u1, u3} S S' (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (NonUnitalNonAssocSemiring.toMul.{u3} S' (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u3} S' _inst_3)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2))) (Distrib.toAdd.{u3} S' (NonUnitalNonAssocSemiring.toDistrib.{u3} S' (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u3} S' _inst_3)))))) e₂) (MonoidHomClass.toMonoidHom.{u2, u1, max u2 u1} R S (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)))) (MulZeroOneClass.toMulOneClass.{u2} R (NonAssocSemiring.toMulZeroOneClass.{u2} R _inst_1)) (MulZeroOneClass.toMulOneClass.{u1} S (NonAssocSemiring.toMulZeroOneClass.{u1} S _inst_2)) (RingHomClass.toMonoidHomClass.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)))) R S _inst_1 _inst_2 (RingEquivClass.toRingHomClass.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)))) R S _inst_1 _inst_2 (RingEquiv.instRingEquivClassRingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)))))) e₁))
+<too large>
 Case conversion may be inaccurate. Consider using '#align ring_equiv.coe_monoid_hom_trans RingEquiv.coe_monoidHom_transₓ'. -/
 @[simp]
 theorem coe_monoidHom_trans [NonAssocSemiring S'] (e₁ : R ≃+* S) (e₂ : S ≃+* S') :
@@ -907,10 +841,7 @@ theorem coe_monoidHom_trans [NonAssocSemiring S'] (e₁ : R ≃+* S) (e₂ : S 
 #align ring_equiv.coe_monoid_hom_trans RingEquiv.coe_monoidHom_trans
 
 /- warning: ring_equiv.coe_add_monoid_hom_trans -> RingEquiv.coe_addMonoidHom_trans is a dubious translation:
-lean 3 declaration is
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(AddMonoid.toAddZeroClass.{u1} R (AddMonoidWithOne.toAddMonoid.{u1} R (AddCommMonoidWithOne.toAddMonoidWithOne.{u1} R (NonAssocSemiring.toAddCommMonoidWithOne.{u1} R _inst_1)))) (AddMonoid.toAddZeroClass.{u2} S (AddMonoidWithOne.toAddMonoid.{u2} S (AddCommMonoidWithOne.toAddMonoidWithOne.{u2} S (NonAssocSemiring.toAddCommMonoidWithOne.{u2} S _inst_2)))) (RingHomClass.toAddMonoidHomClass.{max u1 u2, u1, u2} (RingEquiv.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2))) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2)))) R S _inst_1 _inst_2 (RingEquivClass.toRingHomClass.{max u1 u2, u1, u2} (RingEquiv.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2))) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2)))) R S _inst_1 _inst_2 (RingEquiv.ringEquivClass.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} 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-but is expected to have type
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(NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u3} S' (NonUnitalNonAssocSemiring.toDistrib.{u3} S' (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u3} S' _inst_3)))) (AddMonoid.toAddZeroClass.{u2} R (AddMonoidWithOne.toAddMonoid.{u2} R (AddCommMonoidWithOne.toAddMonoidWithOne.{u2} R (NonAssocSemiring.toAddCommMonoidWithOne.{u2} R _inst_1)))) (AddMonoid.toAddZeroClass.{u3} S' (AddMonoidWithOne.toAddMonoid.{u3} S' (AddCommMonoidWithOne.toAddMonoidWithOne.{u3} S' (NonAssocSemiring.toAddCommMonoidWithOne.{u3} S' _inst_3)))) (RingHomClass.toAddMonoidHomClass.{max u2 u3, u2, u3} (RingEquiv.{u2, u3} R S' (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u3} S' (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u3} S' _inst_3)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u3} S' (NonUnitalNonAssocSemiring.toDistrib.{u3} S' (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u3} S' _inst_3)))) R S' _inst_1 _inst_3 (RingEquivClass.toRingHomClass.{max u2 u3, u2, u3} (RingEquiv.{u2, u3} R S' (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u3} S' (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u3} S' _inst_3)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u3} S' (NonUnitalNonAssocSemiring.toDistrib.{u3} S' (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u3} S' _inst_3)))) R S' _inst_1 _inst_3 (RingEquiv.instRingEquivClassRingEquiv.{u2, u3} R S' (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u3} S' (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u3} S' _inst_3)) (Distrib.toAdd.{u2} R 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(AddMonoidHom.comp.{u2, u1, u3} R S S' (AddMonoid.toAddZeroClass.{u2} R (AddMonoidWithOne.toAddMonoid.{u2} R (AddCommMonoidWithOne.toAddMonoidWithOne.{u2} R (NonAssocSemiring.toAddCommMonoidWithOne.{u2} R _inst_1)))) (AddMonoid.toAddZeroClass.{u1} S (AddMonoidWithOne.toAddMonoid.{u1} S (AddCommMonoidWithOne.toAddMonoidWithOne.{u1} S (NonAssocSemiring.toAddCommMonoidWithOne.{u1} S _inst_2)))) (AddMonoid.toAddZeroClass.{u3} S' (AddMonoidWithOne.toAddMonoid.{u3} S' (AddCommMonoidWithOne.toAddMonoidWithOne.{u3} S' (NonAssocSemiring.toAddCommMonoidWithOne.{u3} S' _inst_3)))) (AddMonoidHomClass.toAddMonoidHom.{u1, u3, max u1 u3} S S' (RingEquiv.{u1, u3} S S' (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (NonUnitalNonAssocSemiring.toMul.{u3} S' (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u3} S' _inst_3)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2))) (Distrib.toAdd.{u3} S' (NonUnitalNonAssocSemiring.toDistrib.{u3} S' (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u3} S' _inst_3)))) (AddMonoid.toAddZeroClass.{u1} S (AddMonoidWithOne.toAddMonoid.{u1} S (AddCommMonoidWithOne.toAddMonoidWithOne.{u1} S (NonAssocSemiring.toAddCommMonoidWithOne.{u1} S _inst_2)))) (AddMonoid.toAddZeroClass.{u3} S' (AddMonoidWithOne.toAddMonoid.{u3} S' (AddCommMonoidWithOne.toAddMonoidWithOne.{u3} S' (NonAssocSemiring.toAddCommMonoidWithOne.{u3} S' _inst_3)))) (RingHomClass.toAddMonoidHomClass.{max u1 u3, u1, u3} (RingEquiv.{u1, u3} S S' (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (NonUnitalNonAssocSemiring.toMul.{u3} S' (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u3} S' _inst_3)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2))) (Distrib.toAdd.{u3} S' (NonUnitalNonAssocSemiring.toDistrib.{u3} S' (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u3} S' _inst_3)))) S S' _inst_2 _inst_3 (RingEquivClass.toRingHomClass.{max u1 u3, u1, u3} (RingEquiv.{u1, u3} S S' (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (NonUnitalNonAssocSemiring.toMul.{u3} S' (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u3} S' _inst_3)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2))) (Distrib.toAdd.{u3} S' (NonUnitalNonAssocSemiring.toDistrib.{u3} S' (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u3} S' _inst_3)))) S S' _inst_2 _inst_3 (RingEquiv.instRingEquivClassRingEquiv.{u1, u3} S S' (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (NonUnitalNonAssocSemiring.toMul.{u3} S' (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u3} S' _inst_3)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2))) (Distrib.toAdd.{u3} S' (NonUnitalNonAssocSemiring.toDistrib.{u3} S' (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u3} S' _inst_3)))))) e₂) (AddMonoidHomClass.toAddMonoidHom.{u2, u1, max u2 u1} R S (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)))) (AddMonoid.toAddZeroClass.{u2} R (AddMonoidWithOne.toAddMonoid.{u2} R (AddCommMonoidWithOne.toAddMonoidWithOne.{u2} R (NonAssocSemiring.toAddCommMonoidWithOne.{u2} R _inst_1)))) (AddMonoid.toAddZeroClass.{u1} S (AddMonoidWithOne.toAddMonoid.{u1} S (AddCommMonoidWithOne.toAddMonoidWithOne.{u1} S (NonAssocSemiring.toAddCommMonoidWithOne.{u1} S _inst_2)))) (RingHomClass.toAddMonoidHomClass.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)))) R S _inst_1 _inst_2 (RingEquivClass.toRingHomClass.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R 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+<too large>
 Case conversion may be inaccurate. Consider using '#align ring_equiv.coe_add_monoid_hom_trans RingEquiv.coe_addMonoidHom_transₓ'. -/
 @[simp]
 theorem coe_addMonoidHom_trans [NonAssocSemiring S'] (e₁ : R ≃+* S) (e₂ : S ≃+* S') :
@@ -923,10 +854,7 @@ in higher generality -/
 
 
 /- warning: ring_equiv.coe_ring_hom_trans -> RingEquiv.coe_ringHom_trans is a dubious translation:
-lean 3 declaration is
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+<too large>
 Case conversion may be inaccurate. Consider using '#align ring_equiv.coe_ring_hom_trans RingEquiv.coe_ringHom_transₓ'. -/
 @[simp]
 theorem coe_ringHom_trans [NonAssocSemiring S'] (e₁ : R ≃+* S) (e₂ : S ≃+* S') :
@@ -935,10 +863,7 @@ theorem coe_ringHom_trans [NonAssocSemiring S'] (e₁ : R ≃+* S) (e₂ : S ≃
 #align ring_equiv.coe_ring_hom_trans RingEquiv.coe_ringHom_trans
 
 /- warning: ring_equiv.comp_symm -> RingEquiv.comp_symm is a dubious translation:
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+<too large>
 Case conversion may be inaccurate. Consider using '#align ring_equiv.comp_symm RingEquiv.comp_symmₓ'. -/
 @[simp]
 theorem comp_symm (e : R ≃+* S) : (e : R →+* S).comp (e.symm : S →+* R) = RingHom.id S :=
@@ -946,10 +871,7 @@ theorem comp_symm (e : R ≃+* S) : (e : R →+* S).comp (e.symm : S →+* R) =
 #align ring_equiv.comp_symm RingEquiv.comp_symm
 
 /- warning: ring_equiv.symm_comp -> RingEquiv.symm_comp is a dubious translation:
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+<too large>
 Case conversion may be inaccurate. Consider using '#align ring_equiv.symm_comp RingEquiv.symm_compₓ'. -/
 @[simp]
 theorem symm_comp (e : R ≃+* S) : (e.symm : S →+* R).comp (e : R →+* S) = RingHom.id R :=
@@ -963,20 +885,14 @@ section NonUnitalRing
 variable [NonUnitalNonAssocRing R] [NonUnitalNonAssocRing S] (f : R ≃+* S) (x y : R)
 
 /- warning: ring_equiv.map_neg -> RingEquiv.map_neg is a dubious translation:
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+<too large>
 Case conversion may be inaccurate. Consider using '#align ring_equiv.map_neg RingEquiv.map_negₓ'. -/
 protected theorem map_neg : f (-x) = -f x :=
   map_neg f x
 #align ring_equiv.map_neg RingEquiv.map_neg
 
 /- warning: ring_equiv.map_sub -> RingEquiv.map_sub is a dubious translation:
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+<too large>
 Case conversion may be inaccurate. Consider using '#align ring_equiv.map_sub RingEquiv.map_subₓ'. -/
 protected theorem map_sub : f (x - y) = f x - f y :=
   map_sub f x y
@@ -989,10 +905,7 @@ section Ring
 variable [NonAssocRing R] [NonAssocRing S] (f : R ≃+* S) (x y : R)
 
 /- warning: ring_equiv.map_neg_one -> RingEquiv.map_neg_one is a dubious translation:
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 Case conversion may be inaccurate. Consider using '#align ring_equiv.map_neg_one RingEquiv.map_neg_oneₓ'. -/
 @[simp]
 theorem map_neg_one : f (-1) = -1 :=
@@ -1000,10 +913,7 @@ theorem map_neg_one : f (-1) = -1 :=
 #align ring_equiv.map_neg_one RingEquiv.map_neg_one
 
 /- warning: ring_equiv.map_eq_neg_one_iff -> RingEquiv.map_eq_neg_one_iff is a dubious translation:
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 Case conversion may be inaccurate. Consider using '#align ring_equiv.map_eq_neg_one_iff RingEquiv.map_eq_neg_one_iffₓ'. -/
 theorem map_eq_neg_one_iff {x : R} : f x = -1 ↔ x = -1 := by
   rw [← neg_eq_iff_eq_neg, ← neg_eq_iff_eq_neg, ← map_neg, RingEquiv.map_eq_one_iff]
@@ -1200,10 +1110,7 @@ theorem toRingHom_eq_coe (f : R ≃+* S) : f.toRingHom = ↑f :=
 #align ring_equiv.to_ring_hom_eq_coe RingEquiv.toRingHom_eq_coe
 
 /- warning: ring_equiv.coe_to_ring_hom -> RingEquiv.coe_toRingHom is a dubious translation:
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+<too large>
 Case conversion may be inaccurate. Consider using '#align ring_equiv.coe_to_ring_hom RingEquiv.coe_toRingHomₓ'. -/
 @[simp, norm_cast]
 theorem coe_toRingHom (f : R ≃+* S) : ⇑(f : R →+* S) = f :=
@@ -1211,10 +1118,7 @@ theorem coe_toRingHom (f : R ≃+* S) : ⇑(f : R →+* S) = f :=
 #align ring_equiv.coe_to_ring_hom RingEquiv.coe_toRingHom
 
 /- warning: ring_equiv.coe_ring_hom_inj_iff -> RingEquiv.coe_ringHom_inj_iff is a dubious translation:
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+<too large>
 Case conversion may be inaccurate. Consider using '#align ring_equiv.coe_ring_hom_inj_iff RingEquiv.coe_ringHom_inj_iffₓ'. -/
 theorem coe_ringHom_inj_iff {R S : Type _} [NonAssocSemiring R] [NonAssocSemiring S]
     (f g : R ≃+* S) : f = g ↔ (f : R →+* S) = g :=
@@ -1222,10 +1126,7 @@ theorem coe_ringHom_inj_iff {R S : Type _} [NonAssocSemiring R] [NonAssocSemirin
 #align ring_equiv.coe_ring_hom_inj_iff RingEquiv.coe_ringHom_inj_iff
 
 /- warning: ring_equiv.to_non_unital_ring_hom_commutes -> RingEquiv.toNonUnitalRingHom_commutes is a dubious translation:
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+<too large>
 Case conversion may be inaccurate. Consider using '#align ring_equiv.to_non_unital_ring_hom_commutes RingEquiv.toNonUnitalRingHom_commutesₓ'. -/
 /-- The two paths coercion can take to a `non_unital_ring_hom` are equivalent -/
 @[simp, norm_cast]
@@ -1256,10 +1157,7 @@ abbrev toAddMonoidHom (e : R ≃+* S) : R →+ S :=
 #align ring_equiv.to_add_monoid_hom RingEquiv.toAddMonoidHom
 
 /- warning: ring_equiv.to_add_monoid_hom_commutes -> RingEquiv.toAddMonoidMom_commutes is a dubious translation:
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+<too large>
 Case conversion may be inaccurate. Consider using '#align ring_equiv.to_add_monoid_hom_commutes RingEquiv.toAddMonoidMom_commutesₓ'. -/
 /-- The two paths coercion can take to an `add_monoid_hom` are equivalent -/
 theorem toAddMonoidMom_commutes (f : R ≃+* S) :
@@ -1268,10 +1166,7 @@ theorem toAddMonoidMom_commutes (f : R ≃+* S) :
 #align ring_equiv.to_add_monoid_hom_commutes RingEquiv.toAddMonoidMom_commutes
 
 /- warning: ring_equiv.to_monoid_hom_commutes -> RingEquiv.toMonoidHom_commutes is a dubious translation:
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 Case conversion may be inaccurate. Consider using '#align ring_equiv.to_monoid_hom_commutes RingEquiv.toMonoidHom_commutesₓ'. -/
 /-- The two paths coercion can take to an `monoid_hom` are equivalent -/
 theorem toMonoidHom_commutes (f : R ≃+* S) : (f : R →+* S).toMonoidHom = (f : R ≃* S).toMonoidHom :=
@@ -1279,10 +1174,7 @@ theorem toMonoidHom_commutes (f : R ≃+* S) : (f : R →+* S).toMonoidHom = (f
 #align ring_equiv.to_monoid_hom_commutes RingEquiv.toMonoidHom_commutes
 
 /- warning: ring_equiv.to_equiv_commutes -> RingEquiv.toEquiv_commutes is a dubious translation:
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-but is expected to have type
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(NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)))) R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2))) (RingEquiv.instRingEquivClassRingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S 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+<too large>
 Case conversion may be inaccurate. Consider using '#align ring_equiv.to_equiv_commutes RingEquiv.toEquiv_commutesₓ'. -/
 /-- The two paths coercion can take to an `equiv` are equivalent -/
 theorem toEquiv_commutes (f : R ≃+* S) : (f : R ≃+ S).toEquiv = (f : R ≃* S).toEquiv :=
@@ -1426,10 +1318,7 @@ section GroupPower
 variable [Semiring R] [Semiring S]
 
 /- warning: ring_equiv.map_pow -> RingEquiv.map_pow is a dubious translation:
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S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S (Semiring.toNonAssocSemiring.{u1} S _inst_2))))) R S (MulEquivClass.toEquivLike.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R (Semiring.toNonAssocSemiring.{u2} R _inst_1))) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S (Semiring.toNonAssocSemiring.{u1} S _inst_2))) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R (Semiring.toNonAssocSemiring.{u2} R _inst_1)))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S (Semiring.toNonAssocSemiring.{u1} S _inst_2))))) R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R (Semiring.toNonAssocSemiring.{u2} R _inst_1))) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S (Semiring.toNonAssocSemiring.{u1} S _inst_2))) (RingEquivClass.toMulEquivClass.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R (Semiring.toNonAssocSemiring.{u2} R _inst_1))) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S (Semiring.toNonAssocSemiring.{u1} S _inst_2))) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R (Semiring.toNonAssocSemiring.{u2} R _inst_1)))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S (Semiring.toNonAssocSemiring.{u1} S _inst_2))))) R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R (Semiring.toNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R (Semiring.toNonAssocSemiring.{u2} R _inst_1)))) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S (Semiring.toNonAssocSemiring.{u1} S _inst_2))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S (Semiring.toNonAssocSemiring.{u1} S _inst_2)))) (RingEquiv.instRingEquivClassRingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R (Semiring.toNonAssocSemiring.{u2} R _inst_1))) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S (Semiring.toNonAssocSemiring.{u1} S _inst_2))) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R (Semiring.toNonAssocSemiring.{u2} R _inst_1)))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S (Semiring.toNonAssocSemiring.{u1} S _inst_2))))))))) f a) n)
+<too large>
 Case conversion may be inaccurate. Consider using '#align ring_equiv.map_pow RingEquiv.map_powₓ'. -/
 protected theorem map_pow (f : R ≃+* S) (a) : ∀ n : ℕ, f (a ^ n) = f a ^ n :=
   map_pow f a

mathlib commit https://github.com/leanprover-community/mathlib/commit/95a87616d63b3cb49d3fe678d416fbe9c4217bf4

@@ -179,7 +179,7 @@ theorem [anonymous] (f : R ≃+* S) : f.toFun = f :=
 lean 3 declaration is
   forall {R : Type.{u1}} {S : Type.{u2}} [_inst_1 : Mul.{u1} R] [_inst_2 : Add.{u1} R] [_inst_3 : Mul.{u2} S] [_inst_4 : Add.{u2} S] (f : RingEquiv.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4), Eq.{max (succ u1) (succ u2)} (R -> S) (coeFn.{max 1 (max (succ u1) (succ u2)) (succ u2) (succ u1), max (succ u1) (succ u2)} (Equiv.{succ u1, succ u2} R S) (fun (_x : Equiv.{succ u1, succ u2} R S) => R -> S) (Equiv.hasCoeToFun.{succ u1, succ u2} R S) ((fun (a : Sort.{max (succ u1) (succ u2)}) (b : Sort.{max 1 (max (succ u1) (succ u2)) (succ u2) (succ u1)}) [self : HasLiftT.{max (succ u1) (succ u2), max 1 (max (succ u1) (succ u2)) (succ u2) (succ u1)} a b] => self.0) (RingEquiv.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4) (Equiv.{succ u1, succ u2} R S) (HasLiftT.mk.{max (succ u1) (succ u2), max 1 (max (succ u1) (succ u2)) (succ u2) (succ u1)} (RingEquiv.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4) (Equiv.{succ u1, succ u2} R S) (CoeTCₓ.coe.{max (succ u1) (succ u2), max 1 (max (succ u1) (succ u2)) (succ u2) (succ u1)} (RingEquiv.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4) (Equiv.{succ u1, succ u2} R S) (Equiv.hasCoeT.{succ u1, succ u2, max (succ u1) (succ u2)} R S (RingEquiv.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4) (MulEquivClass.toEquivLike.{max u1 u2, u1, u2} (RingEquiv.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4) R S _inst_1 _inst_3 (RingEquivClass.toMulEquivClass.{max u1 u2, u1, u2} (RingEquiv.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4) R S _inst_1 _inst_2 _inst_3 _inst_4 (RingEquiv.ringEquivClass.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4)))))) f)) (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingEquiv.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4) (fun (_x : RingEquiv.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4) => R -> S) (RingEquiv.hasCoeToFun.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4) f)
 but is expected to have type
-  forall {R : Type.{u2}} {S : Type.{u1}} [_inst_1 : Mul.{u2} R] [_inst_2 : Mul.{u1} S] [_inst_3 : Add.{u2} R] [_inst_4 : Add.{u1} S] (f : RingEquiv.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4), Eq.{max (succ u2) (succ u1)} (forall (ᾰ : R), (fun (x._@.Mathlib.Logic.Equiv.Defs._hyg.808 : R) => S) ᾰ) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (Equiv.{succ u2, succ u1} R S) R (fun (_x : R) => (fun (x._@.Mathlib.Logic.Equiv.Defs._hyg.808 : R) => S) _x) (Equiv.instFunLikeEquiv.{succ u2, succ u1} R S) (EquivLike.toEquiv.{succ u2, succ u1, max (succ u2) (succ u1)} R S (RingEquiv.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4) (MulEquivClass.toEquivLike.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4) R S _inst_1 _inst_2 (RingEquivClass.toMulEquivClass.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4) R S _inst_1 _inst_3 _inst_2 _inst_4 (RingEquiv.instRingEquivClassRingEquiv.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4))) f)) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4) R (fun (_x : R) => (fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) _x) (EmbeddingLike.toFunLike.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4) R S (EquivLike.toEmbeddingLike.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4) R S (MulEquivClass.toEquivLike.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4) R S _inst_1 _inst_2 (RingEquivClass.toMulEquivClass.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4) R S _inst_1 _inst_3 _inst_2 _inst_4 (RingEquiv.instRingEquivClassRingEquiv.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4))))) f)
+  forall {R : Type.{u2}} {S : Type.{u1}} [_inst_1 : Mul.{u2} R] [_inst_2 : Mul.{u1} S] [_inst_3 : Add.{u2} R] [_inst_4 : Add.{u1} S] (f : RingEquiv.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4), Eq.{max (succ u2) (succ u1)} (forall (ᾰ : R), (fun (x._@.Mathlib.Logic.Equiv.Defs._hyg.812 : R) => S) ᾰ) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (Equiv.{succ u2, succ u1} R S) R (fun (_x : R) => (fun (x._@.Mathlib.Logic.Equiv.Defs._hyg.812 : R) => S) _x) (Equiv.instFunLikeEquiv.{succ u2, succ u1} R S) (EquivLike.toEquiv.{succ u2, succ u1, max (succ u2) (succ u1)} R S (RingEquiv.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4) (MulEquivClass.toEquivLike.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4) R S _inst_1 _inst_2 (RingEquivClass.toMulEquivClass.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4) R S _inst_1 _inst_3 _inst_2 _inst_4 (RingEquiv.instRingEquivClassRingEquiv.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4))) f)) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4) R (fun (_x : R) => (fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) _x) (EmbeddingLike.toFunLike.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4) R S (EquivLike.toEmbeddingLike.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4) R S (MulEquivClass.toEquivLike.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4) R S _inst_1 _inst_2 (RingEquivClass.toMulEquivClass.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4) R S _inst_1 _inst_3 _inst_2 _inst_4 (RingEquiv.instRingEquivClassRingEquiv.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4))))) f)
 Case conversion may be inaccurate. Consider using '#align ring_equiv.coe_to_equiv RingEquiv.coe_toEquivₓ'. -/
 @[simp]
 theorem coe_toEquiv (f : R ≃+* S) : ⇑(f : R ≃ S) = f :=
@@ -725,7 +725,7 @@ theorem map_ne_zero_iff : f x ≠ 0 ↔ x ≠ 0 :=
 lean 3 declaration is
   forall {F : Type.{u1}} {R : Type.{u2}} {S : Type.{u3}} [_inst_1 : NonUnitalNonAssocSemiring.{u2} R] [_inst_2 : NonUnitalNonAssocSemiring.{u3} S] [_inst_3 : NonUnitalRingHomClass.{u1, u2, u3} F R S _inst_1 _inst_2] (f : F), (Function.Bijective.{succ u2, succ u3} R S (coeFn.{succ u1, max (succ u2) (succ u3)} F (fun (_x : F) => R -> S) (FunLike.hasCoeToFun.{succ u1, succ u2, succ u3} F R (fun (_x : R) => S) (MulHomClass.toFunLike.{u1, u2, u3} F R S (Distrib.toHasMul.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toHasMul.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2)) (NonUnitalRingHomClass.toMulHomClass.{u1, u2, u3} F R S _inst_1 _inst_2 _inst_3))) f)) -> (RingEquiv.{u2, u3} R S (Distrib.toHasMul.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toHasAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toHasMul.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2)) (Distrib.toHasAdd.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2)))
 but is expected to have type
-  forall {F : Type.{u1}} {R : Type.{u2}} {S : Type.{u3}} [_inst_1 : NonUnitalNonAssocSemiring.{u2} R] [_inst_2 : NonUnitalNonAssocSemiring.{u3} S] [_inst_3 : NonUnitalRingHomClass.{u1, u2, u3} F R S _inst_1 _inst_2] (f : F), (Function.Bijective.{succ u2, succ u3} R S (FunLike.coe.{succ u1, succ u2, succ u3} F R (fun (_x : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : R) => S) _x) (MulHomClass.toFunLike.{u1, u2, u3} F R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u3} S _inst_2) (NonUnitalRingHomClass.toMulHomClass.{u1, u2, u3} F R S _inst_1 _inst_2 _inst_3)) f)) -> (RingEquiv.{u2, u3} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u3} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2)))
+  forall {F : Type.{u1}} {R : Type.{u2}} {S : Type.{u3}} [_inst_1 : NonUnitalNonAssocSemiring.{u2} R] [_inst_2 : NonUnitalNonAssocSemiring.{u3} S] [_inst_3 : NonUnitalRingHomClass.{u1, u2, u3} F R S _inst_1 _inst_2] (f : F), (Function.Bijective.{succ u2, succ u3} R S (FunLike.coe.{succ u1, succ u2, succ u3} F R (fun (_x : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : R) => S) _x) (MulHomClass.toFunLike.{u1, u2, u3} F R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u3} S _inst_2) (NonUnitalRingHomClass.toMulHomClass.{u1, u2, u3} F R S _inst_1 _inst_2 _inst_3)) f)) -> (RingEquiv.{u2, u3} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u3} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2)))
 Case conversion may be inaccurate. Consider using '#align ring_equiv.of_bijective RingEquiv.ofBijectiveₓ'. -/
 /-- Produce a ring isomorphism from a bijective ring homomorphism. -/
 noncomputable def ofBijective [NonUnitalRingHomClass F R S] (f : F) (hf : Function.Bijective f) :
@@ -739,7 +739,7 @@ noncomputable def ofBijective [NonUnitalRingHomClass F R S] (f : F) (hf : Functi
 lean 3 declaration is
   forall {F : Type.{u1}} {R : Type.{u2}} {S : Type.{u3}} [_inst_1 : NonUnitalNonAssocSemiring.{u2} R] [_inst_2 : NonUnitalNonAssocSemiring.{u3} S] [_inst_3 : NonUnitalRingHomClass.{u1, u2, u3} F R S _inst_1 _inst_2] (f : F) (hf : Function.Bijective.{succ u2, succ u3} R S (coeFn.{succ u1, max (succ u2) (succ u3)} F (fun (_x : F) => R -> S) (FunLike.hasCoeToFun.{succ u1, succ u2, succ u3} F R (fun (_x : R) => S) (MulHomClass.toFunLike.{u1, u2, u3} F R S (Distrib.toHasMul.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toHasMul.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2)) (NonUnitalRingHomClass.toMulHomClass.{u1, u2, u3} F R S _inst_1 _inst_2 _inst_3))) f)), Eq.{max (succ u2) (succ u3)} ((fun (_x : RingEquiv.{u2, u3} R S (Distrib.toHasMul.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toHasAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toHasMul.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2)) (Distrib.toHasAdd.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2))) => R -> S) (RingEquiv.ofBijective.{u1, u2, u3} F R S _inst_1 _inst_2 _inst_3 f hf)) (coeFn.{max (succ u2) (succ u3), max (succ u2) (succ u3)} (RingEquiv.{u2, u3} R S (Distrib.toHasMul.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toHasAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toHasMul.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2)) (Distrib.toHasAdd.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2))) (fun (_x : RingEquiv.{u2, u3} R S (Distrib.toHasMul.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toHasAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toHasMul.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2)) (Distrib.toHasAdd.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2))) => R -> S) (RingEquiv.hasCoeToFun.{u2, u3} R S (Distrib.toHasMul.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toHasAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toHasMul.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2)) (Distrib.toHasAdd.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2))) (RingEquiv.ofBijective.{u1, u2, u3} F R S _inst_1 _inst_2 _inst_3 f hf)) (coeFn.{succ u1, max (succ u2) (succ u3)} F (fun (_x : F) => R -> S) (FunLike.hasCoeToFun.{succ u1, succ u2, succ u3} F R (fun (_x : R) => S) (MulHomClass.toFunLike.{u1, u2, u3} F R S (Distrib.toHasMul.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toHasMul.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2)) (NonUnitalRingHomClass.toMulHomClass.{u1, u2, u3} F R S _inst_1 _inst_2 _inst_3))) f)
 but is expected to have type
-  forall {F : Type.{u3}} {R : Type.{u2}} {S : Type.{u1}} [_inst_1 : NonUnitalNonAssocSemiring.{u2} R] [_inst_2 : NonUnitalNonAssocSemiring.{u1} S] [_inst_3 : NonUnitalRingHomClass.{u3, u2, u1} F R S _inst_1 _inst_2] (f : F) (hf : Function.Bijective.{succ u2, succ u1} R S (FunLike.coe.{succ u3, succ u2, succ u1} F R (fun (_x : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : R) => S) _x) (MulHomClass.toFunLike.{u3, u2, u1} F R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (NonUnitalRingHomClass.toMulHomClass.{u3, u2, u1} F R S _inst_1 _inst_2 _inst_3)) f)), Eq.{max (succ u2) (succ u1)} (forall (a : R), (fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) a) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R (fun (_x : R) => (fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) _x) (EmbeddingLike.toFunLike.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (EquivLike.toEmbeddingLike.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (MulEquivClass.toEquivLike.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (RingEquivClass.toMulEquivClass.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2)) (RingEquiv.instRingEquivClassRingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))))))) (RingEquiv.ofBijective.{u3, u2, u1} F R S _inst_1 _inst_2 _inst_3 f hf)) (FunLike.coe.{succ u3, succ u2, succ u1} F R (fun (_x : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : R) => S) _x) (MulHomClass.toFunLike.{u3, u2, u1} F R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (NonUnitalRingHomClass.toMulHomClass.{u3, u2, u1} F R S _inst_1 _inst_2 _inst_3)) f)
+  forall {F : Type.{u3}} {R : Type.{u2}} {S : Type.{u1}} [_inst_1 : NonUnitalNonAssocSemiring.{u2} R] [_inst_2 : NonUnitalNonAssocSemiring.{u1} S] [_inst_3 : NonUnitalRingHomClass.{u3, u2, u1} F R S _inst_1 _inst_2] (f : F) (hf : Function.Bijective.{succ u2, succ u1} R S (FunLike.coe.{succ u3, succ u2, succ u1} F R (fun (_x : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : R) => S) _x) (MulHomClass.toFunLike.{u3, u2, u1} F R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (NonUnitalRingHomClass.toMulHomClass.{u3, u2, u1} F R S _inst_1 _inst_2 _inst_3)) f)), Eq.{max (succ u2) (succ u1)} (forall (a : R), (fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) a) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R (fun (_x : R) => (fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) _x) (EmbeddingLike.toFunLike.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (EquivLike.toEmbeddingLike.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (MulEquivClass.toEquivLike.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (RingEquivClass.toMulEquivClass.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2)) (RingEquiv.instRingEquivClassRingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))))))) (RingEquiv.ofBijective.{u3, u2, u1} F R S _inst_1 _inst_2 _inst_3 f hf)) (FunLike.coe.{succ u3, succ u2, succ u1} F R (fun (_x : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : R) => S) _x) (MulHomClass.toFunLike.{u3, u2, u1} F R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (NonUnitalRingHomClass.toMulHomClass.{u3, u2, u1} F R S _inst_1 _inst_2 _inst_3)) f)
 Case conversion may be inaccurate. Consider using '#align ring_equiv.coe_of_bijective RingEquiv.coe_ofBijectiveₓ'. -/
 @[simp]
 theorem coe_ofBijective [NonUnitalRingHomClass F R S] (f : F) (hf : Function.Bijective f) :
@@ -751,7 +751,7 @@ theorem coe_ofBijective [NonUnitalRingHomClass F R S] (f : F) (hf : Function.Bij
 lean 3 declaration is
   forall {F : Type.{u1}} {R : Type.{u2}} {S : Type.{u3}} [_inst_1 : NonUnitalNonAssocSemiring.{u2} R] [_inst_2 : NonUnitalNonAssocSemiring.{u3} S] [_inst_3 : NonUnitalRingHomClass.{u1, u2, u3} F R S _inst_1 _inst_2] (f : F) (hf : Function.Bijective.{succ u2, succ u3} R S (coeFn.{succ u1, max (succ u2) (succ u3)} F (fun (_x : F) => R -> S) (FunLike.hasCoeToFun.{succ u1, succ u2, succ u3} F R (fun (_x : R) => S) (MulHomClass.toFunLike.{u1, u2, u3} F R S (Distrib.toHasMul.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toHasMul.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2)) (NonUnitalRingHomClass.toMulHomClass.{u1, u2, u3} F R S _inst_1 _inst_2 _inst_3))) f)) (x : R), Eq.{succ u3} S (coeFn.{max (succ u2) (succ u3), max (succ u2) (succ u3)} (RingEquiv.{u2, u3} R S (Distrib.toHasMul.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toHasAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toHasMul.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2)) (Distrib.toHasAdd.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2))) (fun (_x : RingEquiv.{u2, u3} R S (Distrib.toHasMul.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toHasAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toHasMul.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2)) (Distrib.toHasAdd.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2))) => R -> S) (RingEquiv.hasCoeToFun.{u2, u3} R S (Distrib.toHasMul.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toHasAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toHasMul.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2)) (Distrib.toHasAdd.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2))) (RingEquiv.ofBijective.{u1, u2, u3} F R S _inst_1 _inst_2 _inst_3 f hf) x) (coeFn.{succ u1, max (succ u2) (succ u3)} F (fun (_x : F) => R -> S) (FunLike.hasCoeToFun.{succ u1, succ u2, succ u3} F R (fun (_x : R) => S) (MulHomClass.toFunLike.{u1, u2, u3} F R S (Distrib.toHasMul.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toHasMul.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2)) (NonUnitalRingHomClass.toMulHomClass.{u1, u2, u3} F R S _inst_1 _inst_2 _inst_3))) f x)
 but is expected to have type
-  forall {F : Type.{u3}} {R : Type.{u2}} {S : Type.{u1}} [_inst_1 : NonUnitalNonAssocSemiring.{u2} R] [_inst_2 : NonUnitalNonAssocSemiring.{u1} S] [_inst_3 : NonUnitalRingHomClass.{u3, u2, u1} F R S _inst_1 _inst_2] (f : F) (hf : Function.Bijective.{succ u2, succ u1} R S (FunLike.coe.{succ u3, succ u2, succ u1} F R (fun (_x : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : R) => S) _x) (MulHomClass.toFunLike.{u3, u2, u1} F R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (NonUnitalRingHomClass.toMulHomClass.{u3, u2, u1} F R S _inst_1 _inst_2 _inst_3)) f)) (x : R), Eq.{succ u1} ((fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) x) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R (fun (_x : R) => (fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) _x) (EmbeddingLike.toFunLike.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (EquivLike.toEmbeddingLike.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (MulEquivClass.toEquivLike.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (RingEquivClass.toMulEquivClass.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2)) (RingEquiv.instRingEquivClassRingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))))))) (RingEquiv.ofBijective.{u3, u2, u1} F R S _inst_1 _inst_2 _inst_3 f hf) x) (FunLike.coe.{succ u3, succ u2, succ u1} F R (fun (_x : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : R) => S) _x) (MulHomClass.toFunLike.{u3, u2, u1} F R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (NonUnitalRingHomClass.toMulHomClass.{u3, u2, u1} F R S _inst_1 _inst_2 _inst_3)) f x)
+  forall {F : Type.{u3}} {R : Type.{u2}} {S : Type.{u1}} [_inst_1 : NonUnitalNonAssocSemiring.{u2} R] [_inst_2 : NonUnitalNonAssocSemiring.{u1} S] [_inst_3 : NonUnitalRingHomClass.{u3, u2, u1} F R S _inst_1 _inst_2] (f : F) (hf : Function.Bijective.{succ u2, succ u1} R S (FunLike.coe.{succ u3, succ u2, succ u1} F R (fun (_x : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : R) => S) _x) (MulHomClass.toFunLike.{u3, u2, u1} F R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (NonUnitalRingHomClass.toMulHomClass.{u3, u2, u1} F R S _inst_1 _inst_2 _inst_3)) f)) (x : R), Eq.{succ u1} ((fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) x) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R (fun (_x : R) => (fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) _x) (EmbeddingLike.toFunLike.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (EquivLike.toEmbeddingLike.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (MulEquivClass.toEquivLike.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (RingEquivClass.toMulEquivClass.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2)) (RingEquiv.instRingEquivClassRingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))))))) (RingEquiv.ofBijective.{u3, u2, u1} F R S _inst_1 _inst_2 _inst_3 f hf) x) (FunLike.coe.{succ u3, succ u2, succ u1} F R (fun (_x : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : R) => S) _x) (MulHomClass.toFunLike.{u3, u2, u1} F R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (NonUnitalRingHomClass.toMulHomClass.{u3, u2, u1} F R S _inst_1 _inst_2 _inst_3)) f x)
 Case conversion may be inaccurate. Consider using '#align ring_equiv.of_bijective_apply RingEquiv.ofBijective_applyₓ'. -/
 theorem ofBijective_apply [NonUnitalRingHomClass F R S] (f : F) (hf : Function.Bijective f)
     (x : R) : ofBijective f hf x = f x :=
@@ -1063,7 +1063,7 @@ theorem toNonUnitalRingHom_eq_coe (f : R ≃+* S) : f.toNonUnitalRingHom = ↑f
 lean 3 declaration is
   forall {R : Type.{u1}} {S : Type.{u2}} [_inst_1 : NonUnitalNonAssocSemiring.{u1} R] [_inst_2 : NonUnitalNonAssocSemiring.{u2} S] (f : RingEquiv.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2)) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2))), Eq.{max (succ u1) (succ u2)} (R -> S) (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} R S _inst_1 _inst_2) (fun (_x : NonUnitalRingHom.{u1, u2} R S _inst_1 _inst_2) => R -> S) (NonUnitalRingHom.hasCoeToFun.{u1, u2} R S _inst_1 _inst_2) ((fun (a : Sort.{max (succ u1) (succ u2)}) (b : Sort.{max (succ u1) (succ u2)}) [self : HasLiftT.{max (succ u1) (succ u2), max (succ u1) (succ u2)} a b] => self.0) (RingEquiv.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2)) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2))) (NonUnitalRingHom.{u1, u2} R S _inst_1 _inst_2) (HasLiftT.mk.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingEquiv.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2)) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2))) (NonUnitalRingHom.{u1, u2} R S _inst_1 _inst_2) (CoeTCₓ.coe.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingEquiv.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2)) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2))) (NonUnitalRingHom.{u1, u2} R S _inst_1 _inst_2) (NonUnitalRingHom.hasCoeT.{max u1 u2, u1, u2} (RingEquiv.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2)) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2))) R S _inst_1 _inst_2 (RingEquivClass.toNonUnitalRingHomClass.{max u1 u2, u1, u2} (RingEquiv.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2)) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2))) R S _inst_1 _inst_2 (RingEquiv.ringEquivClass.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2)) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2))))))) f)) (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingEquiv.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2)) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2))) (fun (_x : RingEquiv.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2)) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2))) => R -> S) (RingEquiv.hasCoeToFun.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2)) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2))) f)
 but is expected to have type
-  forall {R : Type.{u2}} {S : Type.{u1}} [_inst_1 : NonUnitalNonAssocSemiring.{u2} R] [_inst_2 : NonUnitalNonAssocSemiring.{u1} S] (f : RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))), Eq.{max (succ u2) (succ u1)} (forall (ᾰ : R), (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : R) => S) ᾰ) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R (fun (_x : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : R) => S) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R S _inst_1 _inst_2 (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2))) (NonUnitalRingHomClass.toNonUnitalRingHom.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S _inst_1 _inst_2 (RingEquivClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S _inst_1 _inst_2 (RingEquiv.instRingEquivClassRingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2)))) f)) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R (fun (_x : R) => (fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) _x) (EmbeddingLike.toFunLike.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (EquivLike.toEmbeddingLike.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (MulEquivClass.toEquivLike.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (RingEquivClass.toMulEquivClass.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2)) (RingEquiv.instRingEquivClassRingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))))))) f)
+  forall {R : Type.{u2}} {S : Type.{u1}} [_inst_1 : NonUnitalNonAssocSemiring.{u2} R] [_inst_2 : NonUnitalNonAssocSemiring.{u1} S] (f : RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))), Eq.{max (succ u2) (succ u1)} (forall (ᾰ : R), (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : R) => S) ᾰ) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R (fun (_x : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : R) => S) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R S _inst_1 _inst_2 (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2))) (NonUnitalRingHomClass.toNonUnitalRingHom.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S _inst_1 _inst_2 (RingEquivClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S _inst_1 _inst_2 (RingEquiv.instRingEquivClassRingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2)))) f)) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R (fun (_x : R) => (fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) _x) (EmbeddingLike.toFunLike.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (EquivLike.toEmbeddingLike.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (MulEquivClass.toEquivLike.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (RingEquivClass.toMulEquivClass.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2)) (RingEquiv.instRingEquivClassRingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))))))) f)
 Case conversion may be inaccurate. Consider using '#align ring_equiv.coe_to_non_unital_ring_hom RingEquiv.coe_toNonUnitalRingHomₓ'. -/
 @[simp, norm_cast]
 theorem coe_toNonUnitalRingHom (f : R ≃+* S) : ⇑(f : R →ₙ+* S) = f :=
@@ -1092,7 +1092,7 @@ theorem toNonUnitalRingHom_refl : (RingEquiv.refl R).toNonUnitalRingHom = NonUni
 lean 3 declaration is
   forall {R : Type.{u1}} {S : Type.{u2}} [_inst_1 : NonUnitalNonAssocSemiring.{u1} R] [_inst_2 : NonUnitalNonAssocSemiring.{u2} S] (e : RingEquiv.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2)) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2))) (y : S), Eq.{succ u2} S (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} R S _inst_1 _inst_2) (fun (_x : NonUnitalRingHom.{u1, u2} R S _inst_1 _inst_2) => R -> S) (NonUnitalRingHom.hasCoeToFun.{u1, u2} R S _inst_1 _inst_2) (RingEquiv.toNonUnitalRingHom.{u1, u2} R S _inst_1 _inst_2 e) (coeFn.{max (succ u2) (succ u1), max (succ u2) (succ u1)} (NonUnitalRingHom.{u2, u1} S R _inst_2 _inst_1) (fun (_x : NonUnitalRingHom.{u2, u1} S R _inst_2 _inst_1) => S -> R) (NonUnitalRingHom.hasCoeToFun.{u2, u1} S R _inst_2 _inst_1) (RingEquiv.toNonUnitalRingHom.{u2, u1} S R _inst_2 _inst_1 (RingEquiv.symm.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2)) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2)) e)) y)) y
 but is expected to have type
-  forall {R : Type.{u2}} {S : Type.{u1}} [_inst_1 : NonUnitalNonAssocSemiring.{u2} R] [_inst_2 : NonUnitalNonAssocSemiring.{u1} S] (e : RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) (y : S), Eq.{succ u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : R) => S) (FunLike.coe.{max (succ u2) (succ u1), succ u1, succ u2} (NonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1) S (fun (a : S) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : S) => R) a) (MulHomClass.toFunLike.{max u2 u1, u1, u2} (NonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1) S R (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u1, u2} (NonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1) S R _inst_2 _inst_1 (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1))) (RingEquiv.toNonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1 (RingEquiv.symm.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2)) e)) y)) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R (fun (_x : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : R) => S) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R S _inst_1 _inst_2 (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2))) (RingEquiv.toNonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2 e) (FunLike.coe.{max (succ u2) (succ u1), succ u1, succ u2} (NonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1) S (fun (_x : S) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : S) => R) _x) (MulHomClass.toFunLike.{max u2 u1, u1, u2} (NonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1) S R (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u1, u2} (NonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1) S R _inst_2 _inst_1 (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1))) (RingEquiv.toNonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1 (RingEquiv.symm.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2)) e)) y)) y
+  forall {R : Type.{u2}} {S : Type.{u1}} [_inst_1 : NonUnitalNonAssocSemiring.{u2} R] [_inst_2 : NonUnitalNonAssocSemiring.{u1} S] (e : RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) (y : S), Eq.{succ u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : R) => S) (FunLike.coe.{max (succ u2) (succ u1), succ u1, succ u2} (NonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1) S (fun (a : S) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : S) => R) a) (MulHomClass.toFunLike.{max u2 u1, u1, u2} (NonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1) S R (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u1, u2} (NonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1) S R _inst_2 _inst_1 (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1))) (RingEquiv.toNonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1 (RingEquiv.symm.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2)) e)) y)) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R (fun (_x : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : R) => S) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R S _inst_1 _inst_2 (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2))) (RingEquiv.toNonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2 e) (FunLike.coe.{max (succ u2) (succ u1), succ u1, succ u2} (NonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1) S (fun (_x : S) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : S) => R) _x) (MulHomClass.toFunLike.{max u2 u1, u1, u2} (NonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1) S R (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u1, u2} (NonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1) S R _inst_2 _inst_1 (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1))) (RingEquiv.toNonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1 (RingEquiv.symm.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2)) e)) y)) y
 Case conversion may be inaccurate. Consider using '#align ring_equiv.to_non_unital_ring_hom_apply_symm_to_non_unital_ring_hom_apply RingEquiv.toNonUnitalRingHom_apply_symm_toNonUnitalRingHom_applyₓ'. -/
 @[simp]
 theorem toNonUnitalRingHom_apply_symm_toNonUnitalRingHom_apply (e : R ≃+* S) :
@@ -1104,7 +1104,7 @@ theorem toNonUnitalRingHom_apply_symm_toNonUnitalRingHom_apply (e : R ≃+* S) :
 lean 3 declaration is
   forall {R : Type.{u1}} {S : Type.{u2}} [_inst_1 : NonUnitalNonAssocSemiring.{u1} R] [_inst_2 : NonUnitalNonAssocSemiring.{u2} S] (e : RingEquiv.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2)) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2))) (x : R), Eq.{succ u1} R (coeFn.{max (succ u2) (succ u1), max (succ u2) (succ u1)} (NonUnitalRingHom.{u2, u1} S R _inst_2 _inst_1) (fun (_x : NonUnitalRingHom.{u2, u1} S R _inst_2 _inst_1) => S -> R) (NonUnitalRingHom.hasCoeToFun.{u2, u1} S R _inst_2 _inst_1) (RingEquiv.toNonUnitalRingHom.{u2, u1} S R _inst_2 _inst_1 (RingEquiv.symm.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2)) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2)) e)) (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} R S _inst_1 _inst_2) (fun (_x : NonUnitalRingHom.{u1, u2} R S _inst_1 _inst_2) => R -> S) (NonUnitalRingHom.hasCoeToFun.{u1, u2} R S _inst_1 _inst_2) (RingEquiv.toNonUnitalRingHom.{u1, u2} R S _inst_1 _inst_2 e) x)) x
 but is expected to have type
-  forall {R : Type.{u2}} {S : Type.{u1}} [_inst_1 : NonUnitalNonAssocSemiring.{u2} R] [_inst_2 : NonUnitalNonAssocSemiring.{u1} S] (e : RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) (x : R), Eq.{succ u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : S) => R) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R (fun (a : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : R) => S) a) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R S _inst_1 _inst_2 (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2))) (RingEquiv.toNonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2 e) x)) (FunLike.coe.{max (succ u2) (succ u1), succ u1, succ u2} (NonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1) S (fun (_x : S) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : S) => R) _x) (MulHomClass.toFunLike.{max u2 u1, u1, u2} (NonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1) S R (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u1, u2} (NonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1) S R _inst_2 _inst_1 (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1))) (RingEquiv.toNonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1 (RingEquiv.symm.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2)) e)) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R (fun (_x : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : R) => S) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R S _inst_1 _inst_2 (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2))) (RingEquiv.toNonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2 e) x)) x
+  forall {R : Type.{u2}} {S : Type.{u1}} [_inst_1 : NonUnitalNonAssocSemiring.{u2} R] [_inst_2 : NonUnitalNonAssocSemiring.{u1} S] (e : RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) (x : R), Eq.{succ u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : S) => R) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R (fun (a : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : R) => S) a) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R S _inst_1 _inst_2 (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2))) (RingEquiv.toNonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2 e) x)) (FunLike.coe.{max (succ u2) (succ u1), succ u1, succ u2} (NonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1) S (fun (_x : S) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : S) => R) _x) (MulHomClass.toFunLike.{max u2 u1, u1, u2} (NonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1) S R (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u1, u2} (NonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1) S R _inst_2 _inst_1 (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1))) (RingEquiv.toNonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1 (RingEquiv.symm.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2)) e)) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R (fun (_x : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : R) => S) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R S _inst_1 _inst_2 (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2))) (RingEquiv.toNonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2 e) x)) x
 Case conversion may be inaccurate. Consider using '#align ring_equiv.symm_to_non_unital_ring_hom_apply_to_non_unital_ring_hom_apply RingEquiv.symm_toNonUnitalRingHom_apply_toNonUnitalRingHom_applyₓ'. -/
 @[simp]
 theorem symm_toNonUnitalRingHom_apply_toNonUnitalRingHom_apply (e : R ≃+* S) :
@@ -1203,7 +1203,7 @@ theorem toRingHom_eq_coe (f : R ≃+* S) : f.toRingHom = ↑f :=
 lean 3 declaration is
   forall {R : Type.{u1}} {S : Type.{u2}} [_inst_1 : NonAssocSemiring.{u1} R] [_inst_2 : NonAssocSemiring.{u2} S] (f : RingEquiv.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2))) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2)))), Eq.{max (succ u1) (succ u2)} (R -> S) (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingHom.{u1, u2} R S _inst_1 _inst_2) (fun (_x : RingHom.{u1, u2} R S _inst_1 _inst_2) => R -> S) (RingHom.hasCoeToFun.{u1, u2} R S _inst_1 _inst_2) ((fun (a : Sort.{max (succ u1) (succ u2)}) (b : Sort.{max (succ u1) (succ u2)}) [self : HasLiftT.{max (succ u1) (succ u2), max (succ u1) (succ u2)} a b] => self.0) (RingEquiv.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2))) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2)))) (RingHom.{u1, u2} R S _inst_1 _inst_2) (HasLiftT.mk.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingEquiv.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2))) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2)))) (RingHom.{u1, u2} R S _inst_1 _inst_2) (CoeTCₓ.coe.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingEquiv.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2))) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2)))) 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(NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2)))) => R -> S) (RingEquiv.hasCoeToFun.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2))) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2)))) f)
 but is expected to have type
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(NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)))) R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2))) (RingEquiv.instRingEquivClassRingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)))))))) f)
+  forall {R : Type.{u2}} {S : Type.{u1}} [_inst_1 : NonAssocSemiring.{u2} R] [_inst_2 : NonAssocSemiring.{u1} S] (f : RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)))), Eq.{max (succ u2) (succ u1)} (forall (ᾰ : R), (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : R) => S) ᾰ) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R (fun (_x : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : R) => S) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R S _inst_1 _inst_2 (RingHom.instRingHomClassRingHom.{u2, u1} R S _inst_1 _inst_2)))) (RingHomClass.toRingHom.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R 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(NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2))))) f)) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)))) R (fun (_x : R) => (fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) _x) (EmbeddingLike.toFunLike.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)))) R S (EquivLike.toEmbeddingLike.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)))) R S (MulEquivClass.toEquivLike.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)))) R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (RingEquivClass.toMulEquivClass.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)))) R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2))) (RingEquiv.instRingEquivClassRingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)))))))) f)
 Case conversion may be inaccurate. Consider using '#align ring_equiv.coe_to_ring_hom RingEquiv.coe_toRingHomₓ'. -/
 @[simp, norm_cast]
 theorem coe_toRingHom (f : R ≃+* S) : ⇑(f : R →+* S) = f :=
@@ -1314,7 +1314,7 @@ theorem toAddMonoidHom_refl : (RingEquiv.refl R).toAddMonoidHom = AddMonoidHom.i
 lean 3 declaration is
   forall {R : Type.{u1}} {S : Type.{u2}} [_inst_1 : NonAssocSemiring.{u1} R] [_inst_2 : NonAssocSemiring.{u2} S] (e : RingEquiv.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2))) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2)))) (y : S), Eq.{succ u2} S (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingHom.{u1, u2} R S _inst_1 _inst_2) (fun (_x : RingHom.{u1, u2} R S _inst_1 _inst_2) => R -> S) (RingHom.hasCoeToFun.{u1, u2} R S _inst_1 _inst_2) (RingEquiv.toRingHom.{u1, u2} R S _inst_1 _inst_2 e) (coeFn.{max (succ u2) (succ u1), max (succ u2) (succ u1)} (RingHom.{u2, u1} S R _inst_2 _inst_1) (fun (_x : RingHom.{u2, u1} S R _inst_2 _inst_1) => S -> R) (RingHom.hasCoeToFun.{u2, u1} S R _inst_2 _inst_1) (RingEquiv.toRingHom.{u2, u1} S R _inst_2 _inst_1 (RingEquiv.symm.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2))) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2))) e)) y)) y
 but is expected to have type
-  forall {R : Type.{u2}} {S : Type.{u1}} [_inst_1 : NonAssocSemiring.{u2} R] [_inst_2 : NonAssocSemiring.{u1} S] (e : RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)))) (y : S), Eq.{succ u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : R) => S) (FunLike.coe.{max (succ u2) (succ u1), succ u1, succ u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S (fun (a : S) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : S) => R) a) (MulHomClass.toFunLike.{max u2 u1, u1, u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S R (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u1, u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u1, u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S R _inst_2 _inst_1 (RingHom.instRingHomClassRingHom.{u1, u2} S R _inst_2 _inst_1)))) (RingEquiv.toRingHom.{u1, u2} S R _inst_2 _inst_1 (RingEquiv.symm.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2))) e)) y)) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R (fun (_x : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : R) => S) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R S _inst_1 _inst_2 (RingHom.instRingHomClassRingHom.{u2, u1} R S _inst_1 _inst_2)))) (RingEquiv.toRingHom.{u2, u1} R S _inst_1 _inst_2 e) (FunLike.coe.{max (succ u2) (succ u1), succ u1, succ u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S (fun (_x : S) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : S) => R) _x) (MulHomClass.toFunLike.{max u2 u1, u1, u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S R (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u1, u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u1, u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S R _inst_2 _inst_1 (RingHom.instRingHomClassRingHom.{u1, u2} S R _inst_2 _inst_1)))) (RingEquiv.toRingHom.{u1, u2} S R _inst_2 _inst_1 (RingEquiv.symm.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2))) e)) y)) y
+  forall {R : Type.{u2}} {S : Type.{u1}} [_inst_1 : NonAssocSemiring.{u2} R] [_inst_2 : NonAssocSemiring.{u1} S] (e : RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)))) (y : S), Eq.{succ u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : R) => S) (FunLike.coe.{max (succ u2) (succ u1), succ u1, succ u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S (fun (a : S) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : S) => R) a) (MulHomClass.toFunLike.{max u2 u1, u1, u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S R (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u1, u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u1, u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S R _inst_2 _inst_1 (RingHom.instRingHomClassRingHom.{u1, u2} S R _inst_2 _inst_1)))) (RingEquiv.toRingHom.{u1, u2} S R _inst_2 _inst_1 (RingEquiv.symm.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2))) e)) y)) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R (fun (_x : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : R) => S) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R S _inst_1 _inst_2 (RingHom.instRingHomClassRingHom.{u2, u1} R S _inst_1 _inst_2)))) (RingEquiv.toRingHom.{u2, u1} R S _inst_1 _inst_2 e) (FunLike.coe.{max (succ u2) (succ u1), succ u1, succ u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S (fun (_x : S) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : S) => R) _x) (MulHomClass.toFunLike.{max u2 u1, u1, u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S R (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u1, u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u1, u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S R _inst_2 _inst_1 (RingHom.instRingHomClassRingHom.{u1, u2} S R _inst_2 _inst_1)))) (RingEquiv.toRingHom.{u1, u2} S R _inst_2 _inst_1 (RingEquiv.symm.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2))) e)) y)) y
 Case conversion may be inaccurate. Consider using '#align ring_equiv.to_ring_hom_apply_symm_to_ring_hom_apply RingEquiv.toRingHom_apply_symm_toRingHom_applyₓ'. -/
 @[simp]
 theorem toRingHom_apply_symm_toRingHom_apply (e : R ≃+* S) :
@@ -1326,7 +1326,7 @@ theorem toRingHom_apply_symm_toRingHom_apply (e : R ≃+* S) :
 lean 3 declaration is
   forall {R : Type.{u1}} {S : Type.{u2}} [_inst_1 : NonAssocSemiring.{u1} R] [_inst_2 : NonAssocSemiring.{u2} S] (e : RingEquiv.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2))) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2)))) (x : R), Eq.{succ u1} R (coeFn.{max (succ u2) (succ u1), max (succ u2) (succ u1)} (RingHom.{u2, u1} S R _inst_2 _inst_1) (fun (_x : RingHom.{u2, u1} S R _inst_2 _inst_1) => S -> R) (RingHom.hasCoeToFun.{u2, u1} S R _inst_2 _inst_1) (RingEquiv.toRingHom.{u2, u1} S R _inst_2 _inst_1 (RingEquiv.symm.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2))) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2))) e)) (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingHom.{u1, u2} R S _inst_1 _inst_2) (fun (_x : RingHom.{u1, u2} R S _inst_1 _inst_2) => R -> S) (RingHom.hasCoeToFun.{u1, u2} R S _inst_1 _inst_2) (RingEquiv.toRingHom.{u1, u2} R S _inst_1 _inst_2 e) x)) x
 but is expected to have type
-  forall {R : Type.{u2}} {S : Type.{u1}} [_inst_1 : NonAssocSemiring.{u2} R] [_inst_2 : NonAssocSemiring.{u1} S] (e : RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)))) (x : R), Eq.{succ u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : S) => R) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R (fun (a : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : R) => S) a) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R S _inst_1 _inst_2 (RingHom.instRingHomClassRingHom.{u2, u1} R S _inst_1 _inst_2)))) (RingEquiv.toRingHom.{u2, u1} R S _inst_1 _inst_2 e) x)) (FunLike.coe.{max (succ u2) (succ u1), succ u1, succ u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S (fun (_x : S) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : S) => R) _x) (MulHomClass.toFunLike.{max u2 u1, u1, u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S R (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u1, u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u1, u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S R _inst_2 _inst_1 (RingHom.instRingHomClassRingHom.{u1, u2} S R _inst_2 _inst_1)))) (RingEquiv.toRingHom.{u1, u2} S R _inst_2 _inst_1 (RingEquiv.symm.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2))) e)) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R (fun (_x : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : R) => S) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R S _inst_1 _inst_2 (RingHom.instRingHomClassRingHom.{u2, u1} R S _inst_1 _inst_2)))) (RingEquiv.toRingHom.{u2, u1} R S _inst_1 _inst_2 e) x)) x
+  forall {R : Type.{u2}} {S : Type.{u1}} [_inst_1 : NonAssocSemiring.{u2} R] [_inst_2 : NonAssocSemiring.{u1} S] (e : RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)))) (x : R), Eq.{succ u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : S) => R) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R (fun (a : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : R) => S) a) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R S _inst_1 _inst_2 (RingHom.instRingHomClassRingHom.{u2, u1} R S _inst_1 _inst_2)))) (RingEquiv.toRingHom.{u2, u1} R S _inst_1 _inst_2 e) x)) (FunLike.coe.{max (succ u2) (succ u1), succ u1, succ u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S (fun (_x : S) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : S) => R) _x) (MulHomClass.toFunLike.{max u2 u1, u1, u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S R (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u1, u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u1, u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S R _inst_2 _inst_1 (RingHom.instRingHomClassRingHom.{u1, u2} S R _inst_2 _inst_1)))) (RingEquiv.toRingHom.{u1, u2} S R _inst_2 _inst_1 (RingEquiv.symm.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2))) e)) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R (fun (_x : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2397 : R) => S) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R S _inst_1 _inst_2 (RingHom.instRingHomClassRingHom.{u2, u1} R S _inst_1 _inst_2)))) (RingEquiv.toRingHom.{u2, u1} R S _inst_1 _inst_2 e) x)) x
 Case conversion may be inaccurate. Consider using '#align ring_equiv.symm_to_ring_hom_apply_to_ring_hom_apply RingEquiv.symm_toRingHom_apply_toRingHom_applyₓ'. -/
 @[simp]
 theorem symm_toRingHom_apply_toRingHom_apply (e : R ≃+* S) :

mathlib commit https://github.com/leanprover-community/mathlib/commit/4c8f86bdbe06f92960d0eb314da8ca64a9d33bca

@@ -999,6 +999,12 @@ theorem map_neg_one : f (-1) = -1 :=
   f.map_one ▸ f.map_neg 1
 #align ring_equiv.map_neg_one RingEquiv.map_neg_one
 
+/- warning: ring_equiv.map_eq_neg_one_iff -> RingEquiv.map_eq_neg_one_iff is a dubious translation:
+lean 3 declaration is
+  forall {R : Type.{u1}} {S : Type.{u2}} [_inst_1 : NonAssocRing.{u1} R] [_inst_2 : NonAssocRing.{u2} S] (f : RingEquiv.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)))) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2)))) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2))))) {x : R}, Iff (Eq.{succ u2} S (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingEquiv.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)))) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2)))) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2))))) (fun (_x : RingEquiv.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)))) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2)))) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2))))) => R -> S) (RingEquiv.hasCoeToFun.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)))) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2)))) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2))))) f x) (Neg.neg.{u2} S (SubNegMonoid.toHasNeg.{u2} S (AddGroup.toSubNegMonoid.{u2} S (AddGroupWithOne.toAddGroup.{u2} S (AddCommGroupWithOne.toAddGroupWithOne.{u2} S (NonAssocRing.toAddCommGroupWithOne.{u2} S _inst_2))))) (OfNat.ofNat.{u2} S 1 (OfNat.mk.{u2} S 1 (One.one.{u2} S (AddMonoidWithOne.toOne.{u2} S (AddGroupWithOne.toAddMonoidWithOne.{u2} S (AddCommGroupWithOne.toAddGroupWithOne.{u2} S (NonAssocRing.toAddCommGroupWithOne.{u2} S _inst_2))))))))) (Eq.{succ u1} R x (Neg.neg.{u1} R (SubNegMonoid.toHasNeg.{u1} R (AddGroup.toSubNegMonoid.{u1} R (AddGroupWithOne.toAddGroup.{u1} R (AddCommGroupWithOne.toAddGroupWithOne.{u1} R (NonAssocRing.toAddCommGroupWithOne.{u1} R _inst_1))))) (OfNat.ofNat.{u1} R 1 (OfNat.mk.{u1} R 1 (One.one.{u1} R (AddMonoidWithOne.toOne.{u1} R (AddGroupWithOne.toAddMonoidWithOne.{u1} R (AddCommGroupWithOne.toAddGroupWithOne.{u1} R (NonAssocRing.toAddCommGroupWithOne.{u1} R _inst_1)))))))))
+but is expected to have type
+  forall {R : Type.{u1}} {S : Type.{u2}} [_inst_1 : NonAssocRing.{u1} R] [_inst_2 : NonAssocRing.{u2} S] (f : RingEquiv.{u1, u2} R S (NonUnitalNonAssocRing.toMul.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)) (NonUnitalNonAssocRing.toMul.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2)) (Distrib.toAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)))) (Distrib.toAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2))))) {x : R}, Iff (Eq.{succ u2} ((fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) x) (FunLike.coe.{max (succ u1) (succ u2), succ u1, succ u2} (RingEquiv.{u1, u2} R S (NonUnitalNonAssocRing.toMul.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)) (NonUnitalNonAssocRing.toMul.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2)) (Distrib.toAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)))) (Distrib.toAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2))))) R (fun (_x : R) => (fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) _x) (EmbeddingLike.toFunLike.{max (succ u1) (succ u2), succ u1, succ u2} (RingEquiv.{u1, u2} R S (NonUnitalNonAssocRing.toMul.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)) (NonUnitalNonAssocRing.toMul.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2)) (Distrib.toAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)))) (Distrib.toAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2))))) R S (EquivLike.toEmbeddingLike.{max (succ u1) (succ u2), succ u1, succ u2} (RingEquiv.{u1, u2} R S (NonUnitalNonAssocRing.toMul.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)) (NonUnitalNonAssocRing.toMul.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2)) (Distrib.toAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)))) (Distrib.toAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2))))) R S (MulEquivClass.toEquivLike.{max u1 u2, u1, u2} (RingEquiv.{u1, u2} R S (NonUnitalNonAssocRing.toMul.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)) (NonUnitalNonAssocRing.toMul.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2)) (Distrib.toAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)))) (Distrib.toAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2))))) R S (NonUnitalNonAssocRing.toMul.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)) (NonUnitalNonAssocRing.toMul.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2)) (RingEquivClass.toMulEquivClass.{max u1 u2, u1, u2} (RingEquiv.{u1, u2} R S (NonUnitalNonAssocRing.toMul.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)) (NonUnitalNonAssocRing.toMul.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2)) (Distrib.toAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)))) (Distrib.toAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2))))) R S (NonUnitalNonAssocRing.toMul.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)) (Distrib.toAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)))) (NonUnitalNonAssocRing.toMul.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2)) (Distrib.toAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2)))) (RingEquiv.instRingEquivClassRingEquiv.{u1, u2} R S (NonUnitalNonAssocRing.toMul.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)) (NonUnitalNonAssocRing.toMul.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2)) (Distrib.toAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)))) (Distrib.toAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2))))))))) f x) (Neg.neg.{u2} ((fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) x) (AddGroupWithOne.toNeg.{u2} ((fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) x) (AddCommGroupWithOne.toAddGroupWithOne.{u2} ((fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) x) (NonAssocRing.toAddCommGroupWithOne.{u2} ((fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) x) _inst_2))) (OfNat.ofNat.{u2} ((fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) x) 1 (One.toOfNat1.{u2} ((fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) x) (NonAssocRing.toOne.{u2} ((fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) x) _inst_2))))) (Eq.{succ u1} R x (Neg.neg.{u1} R (AddGroupWithOne.toNeg.{u1} R (AddCommGroupWithOne.toAddGroupWithOne.{u1} R (NonAssocRing.toAddCommGroupWithOne.{u1} R _inst_1))) (OfNat.ofNat.{u1} R 1 (One.toOfNat1.{u1} R (NonAssocRing.toOne.{u1} R _inst_1)))))
+Case conversion may be inaccurate. Consider using '#align ring_equiv.map_eq_neg_one_iff RingEquiv.map_eq_neg_one_iffₓ'. -/
 theorem map_eq_neg_one_iff {x : R} : f x = -1 ↔ x = -1 := by
   rw [← neg_eq_iff_eq_neg, ← neg_eq_iff_eq_neg, ← map_neg, RingEquiv.map_eq_one_iff]
 #align ring_equiv.map_eq_neg_one_iff RingEquiv.map_eq_neg_one_iff

mathlib commit https://github.com/leanprover-community/mathlib/commit/3905fa80e62c0898131285baab35559fbc4e5cda

@@ -4,7 +4,7 @@ Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Johannes Hölzl, Callum Sutton, Yury Kudryashov
 
 ! This file was ported from Lean 3 source module algebra.ring.equiv
-! leanprover-community/mathlib commit c3291da49cfa65f0d43b094750541c0731edc932
+! leanprover-community/mathlib commit 00f91228655eecdcd3ac97a7fd8dbcb139fe990a
 ! Please do not edit these lines, except to modify the commit id
 ! if you have ported upstream changes.
 -/
@@ -999,6 +999,10 @@ theorem map_neg_one : f (-1) = -1 :=
   f.map_one ▸ f.map_neg 1
 #align ring_equiv.map_neg_one RingEquiv.map_neg_one
 
+theorem map_eq_neg_one_iff {x : R} : f x = -1 ↔ x = -1 := by
+  rw [← neg_eq_iff_eq_neg, ← neg_eq_iff_eq_neg, ← map_neg, RingEquiv.map_eq_one_iff]
+#align ring_equiv.map_eq_neg_one_iff RingEquiv.map_eq_neg_one_iff
+
 end Ring
 
 section NonUnitalSemiringHom

mathlib commit https://github.com/leanprover-community/mathlib/commit/347636a7a80595d55bedf6e6fbd996a3c39da69a

@@ -93,7 +93,7 @@ instance (priority := 100) toAddEquivClass (F R S : Type _) [Mul R] [Add R] [Mul
 lean 3 declaration is
   forall (F : Type.{u1}) (R : Type.{u2}) (S : Type.{u3}) [_inst_1 : NonAssocSemiring.{u2} R] [_inst_2 : NonAssocSemiring.{u3} S] [h : RingEquivClass.{u1, u2, u3} F R S (Distrib.toHasMul.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toHasAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toHasMul.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u3} S _inst_2))) (Distrib.toHasAdd.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u3} S _inst_2)))], RingHomClass.{u1, u2, u3} F R S _inst_1 _inst_2
 but is expected to have type
-  forall {F : Type.{u1}} {R : Type.{u2}} {S : Type.{u3}} {_inst_1 : NonAssocSemiring.{u2} R} {_inst_2 : NonAssocSemiring.{u3} S} [h : RingEquivClass.{u1, u2, u3} F R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (NonUnitalNonAssocSemiring.toMul.{u3} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u3} S _inst_2)) (Distrib.toAdd.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u3} S _inst_2)))], RingHomClass.{u1, u2, u3} F R S _inst_1 _inst_2
+  forall {F : Type.{u1}} {R : Type.{u2}} {S : Type.{u3}} [_inst_1 : NonAssocSemiring.{u2} R] [_inst_2 : NonAssocSemiring.{u3} S] [h : RingEquivClass.{u1, u2, u3} F R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (NonUnitalNonAssocSemiring.toMul.{u3} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u3} S _inst_2)) (Distrib.toAdd.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u3} S _inst_2)))], RingHomClass.{u1, u2, u3} F R S _inst_1 _inst_2
 Case conversion may be inaccurate. Consider using '#align ring_equiv_class.to_ring_hom_class RingEquivClass.toRingHomClassₓ'. -/
 -- See note [lower instance priority]
 instance (priority := 100) toRingHomClass (F R S : Type _) [NonAssocSemiring R] [NonAssocSemiring S]
@@ -109,7 +109,7 @@ instance (priority := 100) toRingHomClass (F R S : Type _) [NonAssocSemiring R]
 lean 3 declaration is
   forall (F : Type.{u1}) (R : Type.{u2}) (S : Type.{u3}) [_inst_1 : NonUnitalNonAssocSemiring.{u2} R] [_inst_2 : NonUnitalNonAssocSemiring.{u3} S] [h : RingEquivClass.{u1, u2, u3} F R S (Distrib.toHasMul.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toHasAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toHasMul.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2)) (Distrib.toHasAdd.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2))], NonUnitalRingHomClass.{u1, u2, u3} F R S _inst_1 _inst_2
 but is expected to have type
-  forall {F : Type.{u1}} {R : Type.{u2}} {S : Type.{u3}} {_inst_1 : NonUnitalNonAssocSemiring.{u2} R} {_inst_2 : NonUnitalNonAssocSemiring.{u3} S} [h : RingEquivClass.{u1, u2, u3} F R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u3} S _inst_2) (Distrib.toAdd.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2))], NonUnitalRingHomClass.{u1, u2, u3} F R S _inst_1 _inst_2
+  forall {F : Type.{u1}} {R : Type.{u2}} {S : Type.{u3}} [_inst_1 : NonUnitalNonAssocSemiring.{u2} R] [_inst_2 : NonUnitalNonAssocSemiring.{u3} S] [h : RingEquivClass.{u1, u2, u3} F R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u3} S _inst_2) (Distrib.toAdd.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2))], NonUnitalRingHomClass.{u1, u2, u3} F R S _inst_1 _inst_2
 Case conversion may be inaccurate. Consider using '#align ring_equiv_class.to_non_unital_ring_hom_class RingEquivClass.toNonUnitalRingHomClassₓ'. -/
 -- See note [lower instance priority]
 instance (priority := 100) toNonUnitalRingHomClass (F R S : Type _) [NonUnitalNonAssocSemiring R]

mathlib commit https://github.com/leanprover-community/mathlib/commit/ce86f4e05e9a9b8da5e316b22c76ce76440c56a1

@@ -990,7 +990,7 @@ variable [NonAssocRing R] [NonAssocRing S] (f : R ≃+* S) (x y : R)
 
 /- warning: ring_equiv.map_neg_one -> RingEquiv.map_neg_one is a dubious translation:
 lean 3 declaration is
-  forall {R : Type.{u1}} {S : Type.{u2}} [_inst_1 : NonAssocRing.{u1} R] [_inst_2 : NonAssocRing.{u2} S] (f : RingEquiv.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)))) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2)))) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2))))), Eq.{succ u2} S (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingEquiv.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)))) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2)))) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2))))) (fun (_x : RingEquiv.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)))) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2)))) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2))))) => R -> S) (RingEquiv.hasCoeToFun.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)))) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2)))) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2))))) f (Neg.neg.{u1} R (SubNegMonoid.toHasNeg.{u1} R (AddGroup.toSubNegMonoid.{u1} R (AddGroupWithOne.toAddGroup.{u1} R (NonAssocRing.toAddGroupWithOne.{u1} R _inst_1)))) (OfNat.ofNat.{u1} R 1 (OfNat.mk.{u1} R 1 (One.one.{u1} R (AddMonoidWithOne.toOne.{u1} R (AddGroupWithOne.toAddMonoidWithOne.{u1} R (NonAssocRing.toAddGroupWithOne.{u1} R _inst_1)))))))) (Neg.neg.{u2} S (SubNegMonoid.toHasNeg.{u2} S (AddGroup.toSubNegMonoid.{u2} S (AddGroupWithOne.toAddGroup.{u2} S (NonAssocRing.toAddGroupWithOne.{u2} S _inst_2)))) (OfNat.ofNat.{u2} S 1 (OfNat.mk.{u2} S 1 (One.one.{u2} S (AddMonoidWithOne.toOne.{u2} S (AddGroupWithOne.toAddMonoidWithOne.{u2} S (NonAssocRing.toAddGroupWithOne.{u2} S _inst_2)))))))
+  forall {R : Type.{u1}} {S : Type.{u2}} [_inst_1 : NonAssocRing.{u1} R] [_inst_2 : NonAssocRing.{u2} S] (f : RingEquiv.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)))) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2)))) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2))))), Eq.{succ u2} S (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingEquiv.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)))) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2)))) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2))))) (fun (_x : RingEquiv.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)))) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2)))) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2))))) => R -> S) (RingEquiv.hasCoeToFun.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)))) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2)))) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2))))) f (Neg.neg.{u1} R (SubNegMonoid.toHasNeg.{u1} R (AddGroup.toSubNegMonoid.{u1} R (AddGroupWithOne.toAddGroup.{u1} R (AddCommGroupWithOne.toAddGroupWithOne.{u1} R (NonAssocRing.toAddCommGroupWithOne.{u1} R _inst_1))))) (OfNat.ofNat.{u1} R 1 (OfNat.mk.{u1} R 1 (One.one.{u1} R (AddMonoidWithOne.toOne.{u1} R (AddGroupWithOne.toAddMonoidWithOne.{u1} R (AddCommGroupWithOne.toAddGroupWithOne.{u1} R (NonAssocRing.toAddCommGroupWithOne.{u1} R _inst_1))))))))) (Neg.neg.{u2} S (SubNegMonoid.toHasNeg.{u2} S (AddGroup.toSubNegMonoid.{u2} S (AddGroupWithOne.toAddGroup.{u2} S (AddCommGroupWithOne.toAddGroupWithOne.{u2} S (NonAssocRing.toAddCommGroupWithOne.{u2} S _inst_2))))) (OfNat.ofNat.{u2} S 1 (OfNat.mk.{u2} S 1 (One.one.{u2} S (AddMonoidWithOne.toOne.{u2} S (AddGroupWithOne.toAddMonoidWithOne.{u2} S (AddCommGroupWithOne.toAddGroupWithOne.{u2} S (NonAssocRing.toAddCommGroupWithOne.{u2} S _inst_2))))))))
 but is expected to have type
   forall {R : Type.{u1}} {S : Type.{u2}} [_inst_1 : NonAssocRing.{u1} R] [_inst_2 : NonAssocRing.{u2} S] (f : RingEquiv.{u1, u2} R S (NonUnitalNonAssocRing.toMul.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)) (NonUnitalNonAssocRing.toMul.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2)) (Distrib.toAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)))) (Distrib.toAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2))))), Eq.{succ u2} ((fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) (Neg.neg.{u1} R (AddGroupWithOne.toNeg.{u1} R (AddCommGroupWithOne.toAddGroupWithOne.{u1} R (NonAssocRing.toAddCommGroupWithOne.{u1} R _inst_1))) (OfNat.ofNat.{u1} R 1 (One.toOfNat1.{u1} R (NonAssocRing.toOne.{u1} R _inst_1))))) (FunLike.coe.{max (succ u1) (succ u2), succ u1, succ u2} (RingEquiv.{u1, u2} R S (NonUnitalNonAssocRing.toMul.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)) (NonUnitalNonAssocRing.toMul.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2)) (Distrib.toAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)))) (Distrib.toAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2))))) R (fun (_x : R) => (fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) _x) (EmbeddingLike.toFunLike.{max (succ u1) (succ u2), succ u1, succ u2} (RingEquiv.{u1, u2} R S (NonUnitalNonAssocRing.toMul.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)) (NonUnitalNonAssocRing.toMul.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2)) (Distrib.toAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)))) (Distrib.toAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2))))) R S (EquivLike.toEmbeddingLike.{max (succ u1) (succ u2), succ u1, succ u2} (RingEquiv.{u1, u2} R S (NonUnitalNonAssocRing.toMul.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)) (NonUnitalNonAssocRing.toMul.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2)) (Distrib.toAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)))) (Distrib.toAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2))))) R S (MulEquivClass.toEquivLike.{max u1 u2, u1, u2} (RingEquiv.{u1, u2} R S (NonUnitalNonAssocRing.toMul.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)) (NonUnitalNonAssocRing.toMul.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2)) (Distrib.toAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)))) (Distrib.toAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2))))) R S (NonUnitalNonAssocRing.toMul.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)) (NonUnitalNonAssocRing.toMul.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2)) (RingEquivClass.toMulEquivClass.{max u1 u2, u1, u2} (RingEquiv.{u1, u2} R S (NonUnitalNonAssocRing.toMul.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)) (NonUnitalNonAssocRing.toMul.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2)) (Distrib.toAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)))) (Distrib.toAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2))))) R S (NonUnitalNonAssocRing.toMul.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)) (Distrib.toAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)))) (NonUnitalNonAssocRing.toMul.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2)) (Distrib.toAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2)))) (RingEquiv.instRingEquivClassRingEquiv.{u1, u2} R S (NonUnitalNonAssocRing.toMul.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)) (NonUnitalNonAssocRing.toMul.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2)) (Distrib.toAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)))) (Distrib.toAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2))))))))) f (Neg.neg.{u1} R (AddGroupWithOne.toNeg.{u1} R (AddCommGroupWithOne.toAddGroupWithOne.{u1} R (NonAssocRing.toAddCommGroupWithOne.{u1} R _inst_1))) (OfNat.ofNat.{u1} R 1 (One.toOfNat1.{u1} R (NonAssocRing.toOne.{u1} R _inst_1))))) (Neg.neg.{u2} ((fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) (Neg.neg.{u1} R (AddGroupWithOne.toNeg.{u1} R (AddCommGroupWithOne.toAddGroupWithOne.{u1} R (NonAssocRing.toAddCommGroupWithOne.{u1} R _inst_1))) (OfNat.ofNat.{u1} R 1 (One.toOfNat1.{u1} R (NonAssocRing.toOne.{u1} R _inst_1))))) (AddGroupWithOne.toNeg.{u2} ((fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) (Neg.neg.{u1} R (AddGroupWithOne.toNeg.{u1} R (AddCommGroupWithOne.toAddGroupWithOne.{u1} R (NonAssocRing.toAddCommGroupWithOne.{u1} R _inst_1))) (OfNat.ofNat.{u1} R 1 (One.toOfNat1.{u1} R (NonAssocRing.toOne.{u1} R _inst_1))))) (AddCommGroupWithOne.toAddGroupWithOne.{u2} ((fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) (Neg.neg.{u1} R (AddGroupWithOne.toNeg.{u1} R (AddCommGroupWithOne.toAddGroupWithOne.{u1} R (NonAssocRing.toAddCommGroupWithOne.{u1} R _inst_1))) (OfNat.ofNat.{u1} R 1 (One.toOfNat1.{u1} R (NonAssocRing.toOne.{u1} R _inst_1))))) (NonAssocRing.toAddCommGroupWithOne.{u2} ((fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) (Neg.neg.{u1} R (AddGroupWithOne.toNeg.{u1} R (AddCommGroupWithOne.toAddGroupWithOne.{u1} R (NonAssocRing.toAddCommGroupWithOne.{u1} R _inst_1))) (OfNat.ofNat.{u1} R 1 (One.toOfNat1.{u1} R (NonAssocRing.toOne.{u1} R _inst_1))))) _inst_2))) (OfNat.ofNat.{u2} ((fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) (Neg.neg.{u1} R (AddGroupWithOne.toNeg.{u1} R (AddCommGroupWithOne.toAddGroupWithOne.{u1} R (NonAssocRing.toAddCommGroupWithOne.{u1} R _inst_1))) (OfNat.ofNat.{u1} R 1 (One.toOfNat1.{u1} R (NonAssocRing.toOne.{u1} R _inst_1))))) 1 (One.toOfNat1.{u2} ((fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) (Neg.neg.{u1} R (AddGroupWithOne.toNeg.{u1} R (AddCommGroupWithOne.toAddGroupWithOne.{u1} R (NonAssocRing.toAddCommGroupWithOne.{u1} R _inst_1))) (OfNat.ofNat.{u1} R 1 (One.toOfNat1.{u1} R (NonAssocRing.toOne.{u1} R _inst_1))))) (NonAssocRing.toOne.{u2} ((fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) (Neg.neg.{u1} R (AddGroupWithOne.toNeg.{u1} R (AddCommGroupWithOne.toAddGroupWithOne.{u1} R (NonAssocRing.toAddCommGroupWithOne.{u1} R _inst_1))) (OfNat.ofNat.{u1} R 1 (One.toOfNat1.{u1} R (NonAssocRing.toOne.{u1} R _inst_1))))) _inst_2))))
 Case conversion may be inaccurate. Consider using '#align ring_equiv.map_neg_one RingEquiv.map_neg_oneₓ'. -/

mathlib commit https://github.com/leanprover-community/mathlib/commit/b19481deb571022990f1baa9cbf9172e6757a479

@@ -992,7 +992,7 @@ variable [NonAssocRing R] [NonAssocRing S] (f : R ≃+* S) (x y : R)
 lean 3 declaration is
   forall {R : Type.{u1}} {S : Type.{u2}} [_inst_1 : NonAssocRing.{u1} R] [_inst_2 : NonAssocRing.{u2} S] (f : RingEquiv.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)))) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2)))) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2))))), Eq.{succ u2} S (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingEquiv.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)))) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2)))) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2))))) (fun (_x : RingEquiv.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)))) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2)))) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2))))) => R -> S) (RingEquiv.hasCoeToFun.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)))) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2)))) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2))))) f (Neg.neg.{u1} R (SubNegMonoid.toHasNeg.{u1} R (AddGroup.toSubNegMonoid.{u1} R (AddGroupWithOne.toAddGroup.{u1} R (NonAssocRing.toAddGroupWithOne.{u1} R _inst_1)))) (OfNat.ofNat.{u1} R 1 (OfNat.mk.{u1} R 1 (One.one.{u1} R (AddMonoidWithOne.toOne.{u1} R (AddGroupWithOne.toAddMonoidWithOne.{u1} R (NonAssocRing.toAddGroupWithOne.{u1} R _inst_1)))))))) (Neg.neg.{u2} S (SubNegMonoid.toHasNeg.{u2} S (AddGroup.toSubNegMonoid.{u2} S (AddGroupWithOne.toAddGroup.{u2} S (NonAssocRing.toAddGroupWithOne.{u2} S _inst_2)))) (OfNat.ofNat.{u2} S 1 (OfNat.mk.{u2} S 1 (One.one.{u2} S (AddMonoidWithOne.toOne.{u2} S (AddGroupWithOne.toAddMonoidWithOne.{u2} S (NonAssocRing.toAddGroupWithOne.{u2} S _inst_2)))))))
 but is expected to have type
-  forall {R : Type.{u1}} {S : Type.{u2}} [_inst_1 : NonAssocRing.{u1} R] [_inst_2 : NonAssocRing.{u2} S] (f : RingEquiv.{u1, u2} R S (NonUnitalNonAssocRing.toMul.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)) (NonUnitalNonAssocRing.toMul.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2)) (Distrib.toAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)))) (Distrib.toAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2))))), Eq.{succ u2} ((fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) (Neg.neg.{u1} R (AddGroupWithOne.toNeg.{u1} R (NonAssocRing.toAddGroupWithOne.{u1} R _inst_1)) (OfNat.ofNat.{u1} R 1 (One.toOfNat1.{u1} R (NonAssocRing.toOne.{u1} R _inst_1))))) (FunLike.coe.{max (succ u1) (succ u2), succ u1, succ u2} (RingEquiv.{u1, u2} R S (NonUnitalNonAssocRing.toMul.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)) (NonUnitalNonAssocRing.toMul.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2)) (Distrib.toAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)))) (Distrib.toAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2))))) R (fun (_x : R) => (fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) _x) (EmbeddingLike.toFunLike.{max (succ u1) (succ u2), succ u1, succ u2} (RingEquiv.{u1, u2} R S (NonUnitalNonAssocRing.toMul.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)) (NonUnitalNonAssocRing.toMul.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2)) (Distrib.toAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)))) (Distrib.toAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2))))) R S (EquivLike.toEmbeddingLike.{max (succ u1) (succ u2), succ u1, succ u2} (RingEquiv.{u1, u2} R S (NonUnitalNonAssocRing.toMul.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)) (NonUnitalNonAssocRing.toMul.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2)) (Distrib.toAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)))) (Distrib.toAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2))))) R S (MulEquivClass.toEquivLike.{max u1 u2, u1, u2} (RingEquiv.{u1, u2} R S (NonUnitalNonAssocRing.toMul.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)) (NonUnitalNonAssocRing.toMul.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2)) (Distrib.toAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)))) (Distrib.toAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2))))) R S (NonUnitalNonAssocRing.toMul.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)) (NonUnitalNonAssocRing.toMul.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2)) (RingEquivClass.toMulEquivClass.{max u1 u2, u1, u2} (RingEquiv.{u1, u2} R S (NonUnitalNonAssocRing.toMul.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)) (NonUnitalNonAssocRing.toMul.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2)) (Distrib.toAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)))) (Distrib.toAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2))))) R S (NonUnitalNonAssocRing.toMul.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)) (Distrib.toAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)))) (NonUnitalNonAssocRing.toMul.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2)) (Distrib.toAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2)))) (RingEquiv.instRingEquivClassRingEquiv.{u1, u2} R S (NonUnitalNonAssocRing.toMul.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)) (NonUnitalNonAssocRing.toMul.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2)) (Distrib.toAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)))) (Distrib.toAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2))))))))) f (Neg.neg.{u1} R (AddGroupWithOne.toNeg.{u1} R (NonAssocRing.toAddGroupWithOne.{u1} R _inst_1)) (OfNat.ofNat.{u1} R 1 (One.toOfNat1.{u1} R (NonAssocRing.toOne.{u1} R _inst_1))))) (Neg.neg.{u2} ((fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) (Neg.neg.{u1} R (AddGroupWithOne.toNeg.{u1} R (NonAssocRing.toAddGroupWithOne.{u1} R _inst_1)) (OfNat.ofNat.{u1} R 1 (One.toOfNat1.{u1} R (NonAssocRing.toOne.{u1} R _inst_1))))) (AddGroupWithOne.toNeg.{u2} ((fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) (Neg.neg.{u1} R (AddGroupWithOne.toNeg.{u1} R (NonAssocRing.toAddGroupWithOne.{u1} R _inst_1)) (OfNat.ofNat.{u1} R 1 (One.toOfNat1.{u1} R (NonAssocRing.toOne.{u1} R _inst_1))))) (NonAssocRing.toAddGroupWithOne.{u2} ((fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) (Neg.neg.{u1} R (AddGroupWithOne.toNeg.{u1} R (NonAssocRing.toAddGroupWithOne.{u1} R _inst_1)) (OfNat.ofNat.{u1} R 1 (One.toOfNat1.{u1} R (NonAssocRing.toOne.{u1} R _inst_1))))) _inst_2)) (OfNat.ofNat.{u2} ((fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) (Neg.neg.{u1} R (AddGroupWithOne.toNeg.{u1} R (NonAssocRing.toAddGroupWithOne.{u1} R _inst_1)) (OfNat.ofNat.{u1} R 1 (One.toOfNat1.{u1} R (NonAssocRing.toOne.{u1} R _inst_1))))) 1 (One.toOfNat1.{u2} ((fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) (Neg.neg.{u1} R (AddGroupWithOne.toNeg.{u1} R (NonAssocRing.toAddGroupWithOne.{u1} R _inst_1)) (OfNat.ofNat.{u1} R 1 (One.toOfNat1.{u1} R (NonAssocRing.toOne.{u1} R _inst_1))))) (NonAssocRing.toOne.{u2} ((fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) (Neg.neg.{u1} R (AddGroupWithOne.toNeg.{u1} R (NonAssocRing.toAddGroupWithOne.{u1} R _inst_1)) (OfNat.ofNat.{u1} R 1 (One.toOfNat1.{u1} R (NonAssocRing.toOne.{u1} R _inst_1))))) _inst_2))))
+  forall {R : Type.{u1}} {S : Type.{u2}} [_inst_1 : NonAssocRing.{u1} R] [_inst_2 : NonAssocRing.{u2} S] (f : RingEquiv.{u1, u2} R S (NonUnitalNonAssocRing.toMul.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)) (NonUnitalNonAssocRing.toMul.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2)) (Distrib.toAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)))) (Distrib.toAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2))))), Eq.{succ u2} ((fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) (Neg.neg.{u1} R (AddGroupWithOne.toNeg.{u1} R (AddCommGroupWithOne.toAddGroupWithOne.{u1} R (NonAssocRing.toAddCommGroupWithOne.{u1} R _inst_1))) (OfNat.ofNat.{u1} R 1 (One.toOfNat1.{u1} R (NonAssocRing.toOne.{u1} R _inst_1))))) (FunLike.coe.{max (succ u1) (succ u2), succ u1, succ u2} (RingEquiv.{u1, u2} R S (NonUnitalNonAssocRing.toMul.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)) (NonUnitalNonAssocRing.toMul.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2)) (Distrib.toAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)))) (Distrib.toAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2))))) R (fun (_x : R) => (fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) _x) (EmbeddingLike.toFunLike.{max (succ u1) (succ u2), succ u1, succ u2} (RingEquiv.{u1, u2} R S (NonUnitalNonAssocRing.toMul.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)) (NonUnitalNonAssocRing.toMul.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2)) (Distrib.toAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)))) (Distrib.toAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2))))) R S (EquivLike.toEmbeddingLike.{max (succ u1) (succ u2), succ u1, succ u2} (RingEquiv.{u1, u2} R S (NonUnitalNonAssocRing.toMul.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)) (NonUnitalNonAssocRing.toMul.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2)) (Distrib.toAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)))) (Distrib.toAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2))))) R S (MulEquivClass.toEquivLike.{max u1 u2, u1, u2} (RingEquiv.{u1, u2} R S (NonUnitalNonAssocRing.toMul.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)) (NonUnitalNonAssocRing.toMul.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2)) (Distrib.toAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)))) (Distrib.toAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2))))) R S (NonUnitalNonAssocRing.toMul.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)) (NonUnitalNonAssocRing.toMul.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2)) (RingEquivClass.toMulEquivClass.{max u1 u2, u1, u2} (RingEquiv.{u1, u2} R S (NonUnitalNonAssocRing.toMul.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)) (NonUnitalNonAssocRing.toMul.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2)) (Distrib.toAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)))) (Distrib.toAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2))))) R S (NonUnitalNonAssocRing.toMul.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)) (Distrib.toAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)))) (NonUnitalNonAssocRing.toMul.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2)) (Distrib.toAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2)))) (RingEquiv.instRingEquivClassRingEquiv.{u1, u2} R S (NonUnitalNonAssocRing.toMul.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)) (NonUnitalNonAssocRing.toMul.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2)) (Distrib.toAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u1} R (NonAssocRing.toNonUnitalNonAssocRing.{u1} R _inst_1)))) (Distrib.toAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonUnitalNonAssocRing.toNonUnitalNonAssocSemiring.{u2} S (NonAssocRing.toNonUnitalNonAssocRing.{u2} S _inst_2))))))))) f (Neg.neg.{u1} R (AddGroupWithOne.toNeg.{u1} R (AddCommGroupWithOne.toAddGroupWithOne.{u1} R (NonAssocRing.toAddCommGroupWithOne.{u1} R _inst_1))) (OfNat.ofNat.{u1} R 1 (One.toOfNat1.{u1} R (NonAssocRing.toOne.{u1} R _inst_1))))) (Neg.neg.{u2} ((fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) (Neg.neg.{u1} R (AddGroupWithOne.toNeg.{u1} R (AddCommGroupWithOne.toAddGroupWithOne.{u1} R (NonAssocRing.toAddCommGroupWithOne.{u1} R _inst_1))) (OfNat.ofNat.{u1} R 1 (One.toOfNat1.{u1} R (NonAssocRing.toOne.{u1} R _inst_1))))) (AddGroupWithOne.toNeg.{u2} ((fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) (Neg.neg.{u1} R (AddGroupWithOne.toNeg.{u1} R (AddCommGroupWithOne.toAddGroupWithOne.{u1} R (NonAssocRing.toAddCommGroupWithOne.{u1} R _inst_1))) (OfNat.ofNat.{u1} R 1 (One.toOfNat1.{u1} R (NonAssocRing.toOne.{u1} R _inst_1))))) (AddCommGroupWithOne.toAddGroupWithOne.{u2} ((fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) (Neg.neg.{u1} R (AddGroupWithOne.toNeg.{u1} R (AddCommGroupWithOne.toAddGroupWithOne.{u1} R (NonAssocRing.toAddCommGroupWithOne.{u1} R _inst_1))) (OfNat.ofNat.{u1} R 1 (One.toOfNat1.{u1} R (NonAssocRing.toOne.{u1} R _inst_1))))) (NonAssocRing.toAddCommGroupWithOne.{u2} ((fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) (Neg.neg.{u1} R (AddGroupWithOne.toNeg.{u1} R (AddCommGroupWithOne.toAddGroupWithOne.{u1} R (NonAssocRing.toAddCommGroupWithOne.{u1} R _inst_1))) (OfNat.ofNat.{u1} R 1 (One.toOfNat1.{u1} R (NonAssocRing.toOne.{u1} R _inst_1))))) _inst_2))) (OfNat.ofNat.{u2} ((fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) (Neg.neg.{u1} R (AddGroupWithOne.toNeg.{u1} R (AddCommGroupWithOne.toAddGroupWithOne.{u1} R (NonAssocRing.toAddCommGroupWithOne.{u1} R _inst_1))) (OfNat.ofNat.{u1} R 1 (One.toOfNat1.{u1} R (NonAssocRing.toOne.{u1} R _inst_1))))) 1 (One.toOfNat1.{u2} ((fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) (Neg.neg.{u1} R (AddGroupWithOne.toNeg.{u1} R (AddCommGroupWithOne.toAddGroupWithOne.{u1} R (NonAssocRing.toAddCommGroupWithOne.{u1} R _inst_1))) (OfNat.ofNat.{u1} R 1 (One.toOfNat1.{u1} R (NonAssocRing.toOne.{u1} R _inst_1))))) (NonAssocRing.toOne.{u2} ((fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) (Neg.neg.{u1} R (AddGroupWithOne.toNeg.{u1} R (AddCommGroupWithOne.toAddGroupWithOne.{u1} R (NonAssocRing.toAddCommGroupWithOne.{u1} R _inst_1))) (OfNat.ofNat.{u1} R 1 (One.toOfNat1.{u1} R (NonAssocRing.toOne.{u1} R _inst_1))))) _inst_2))))
 Case conversion may be inaccurate. Consider using '#align ring_equiv.map_neg_one RingEquiv.map_neg_oneₓ'. -/
 @[simp]
 theorem map_neg_one : f (-1) = -1 :=

mathlib commit https://github.com/leanprover-community/mathlib/commit/b19481deb571022990f1baa9cbf9172e6757a479

@@ -621,7 +621,7 @@ open MulOpposite
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} [_inst_1 : Add.{u1} α] [_inst_2 : Mul.{u1} α] [_inst_3 : Add.{u2} β] [_inst_4 : Mul.{u2} β], Equiv.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingEquiv.{u1, u2} α β _inst_2 _inst_1 _inst_4 _inst_3) (RingEquiv.{u1, u2} (MulOpposite.{u1} α) (MulOpposite.{u2} β) (MulOpposite.hasMul.{u1} α _inst_2) (MulOpposite.hasAdd.{u1} α _inst_1) (MulOpposite.hasMul.{u2} β _inst_4) (MulOpposite.hasAdd.{u2} β _inst_3))
 but is expected to have type
-  forall {α : Type.{u1}} {β : Type.{u2}} [_inst_1 : Add.{u1} α] [_inst_2 : Mul.{u1} α] [_inst_3 : Add.{u2} β] [_inst_4 : Mul.{u2} β], Equiv.{max (succ u2) (succ u1), max (succ u2) (succ u1)} (RingEquiv.{u1, u2} α β _inst_2 _inst_4 _inst_1 _inst_3) (RingEquiv.{u1, u2} (MulOpposite.{u1} α) (MulOpposite.{u2} β) (MulOpposite.instMulMulOpposite.{u1} α _inst_2) (MulOpposite.instMulMulOpposite.{u2} β _inst_4) (MulOpposite.instAddMulOpposite.{u1} α _inst_1) (MulOpposite.instAddMulOpposite.{u2} β _inst_3))
+  forall {α : Type.{u1}} {β : Type.{u2}} [_inst_1 : Add.{u1} α] [_inst_2 : Mul.{u1} α] [_inst_3 : Add.{u2} β] [_inst_4 : Mul.{u2} β], Equiv.{max (succ u2) (succ u1), max (succ u2) (succ u1)} (RingEquiv.{u1, u2} α β _inst_2 _inst_4 _inst_1 _inst_3) (RingEquiv.{u1, u2} (MulOpposite.{u1} α) (MulOpposite.{u2} β) (MulOpposite.mul.{u1} α _inst_2) (MulOpposite.mul.{u2} β _inst_4) (MulOpposite.add.{u1} α _inst_1) (MulOpposite.add.{u2} β _inst_3))
 Case conversion may be inaccurate. Consider using '#align ring_equiv.op RingEquiv.opₓ'. -/
 /-- A ring iso `α ≃+* β` can equivalently be viewed as a ring iso `αᵐᵒᵖ ≃+* βᵐᵒᵖ`. -/
 @[simps]
@@ -641,7 +641,7 @@ protected def op {α β} [Add α] [Mul α] [Add β] [Mul β] : α ≃+* β ≃ (
 lean 3 declaration is
   forall {α : Type.{u1}} {β : Type.{u2}} [_inst_1 : Add.{u1} α] [_inst_2 : Mul.{u1} α] [_inst_3 : Add.{u2} β] [_inst_4 : Mul.{u2} β], Equiv.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingEquiv.{u1, u2} (MulOpposite.{u1} α) (MulOpposite.{u2} β) (MulOpposite.hasMul.{u1} α _inst_2) (MulOpposite.hasAdd.{u1} α _inst_1) (MulOpposite.hasMul.{u2} β _inst_4) (MulOpposite.hasAdd.{u2} β _inst_3)) (RingEquiv.{u1, u2} α β _inst_2 _inst_1 _inst_4 _inst_3)
 but is expected to have type
-  forall {α : Type.{u1}} {β : Type.{u2}} [_inst_1 : Add.{u1} α] [_inst_2 : Mul.{u1} α] [_inst_3 : Add.{u2} β] [_inst_4 : Mul.{u2} β], Equiv.{max (succ u2) (succ u1), max (succ u2) (succ u1)} (RingEquiv.{u1, u2} (MulOpposite.{u1} α) (MulOpposite.{u2} β) (MulOpposite.instMulMulOpposite.{u1} α _inst_2) (MulOpposite.instMulMulOpposite.{u2} β _inst_4) (MulOpposite.instAddMulOpposite.{u1} α _inst_1) (MulOpposite.instAddMulOpposite.{u2} β _inst_3)) (RingEquiv.{u1, u2} α β _inst_2 _inst_4 _inst_1 _inst_3)
+  forall {α : Type.{u1}} {β : Type.{u2}} [_inst_1 : Add.{u1} α] [_inst_2 : Mul.{u1} α] [_inst_3 : Add.{u2} β] [_inst_4 : Mul.{u2} β], Equiv.{max (succ u2) (succ u1), max (succ u2) (succ u1)} (RingEquiv.{u1, u2} (MulOpposite.{u1} α) (MulOpposite.{u2} β) (MulOpposite.mul.{u1} α _inst_2) (MulOpposite.mul.{u2} β _inst_4) (MulOpposite.add.{u1} α _inst_1) (MulOpposite.add.{u2} β _inst_3)) (RingEquiv.{u1, u2} α β _inst_2 _inst_4 _inst_1 _inst_3)
 Case conversion may be inaccurate. Consider using '#align ring_equiv.unop RingEquiv.unopₓ'. -/
 /-- The 'unopposite' of a ring iso `αᵐᵒᵖ ≃+* βᵐᵒᵖ`. Inverse to `ring_equiv.op`. -/
 @[simp]
@@ -657,7 +657,7 @@ variable (R) [NonUnitalCommSemiring R]
 lean 3 declaration is
   forall (R : Type.{u1}) [_inst_1 : NonUnitalCommSemiring.{u1} R], RingEquiv.{u1, u1} R (MulOpposite.{u1} R) (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalSemiring.toNonUnitalNonAssocSemiring.{u1} R (NonUnitalCommSemiring.toNonUnitalSemiring.{u1} R _inst_1)))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalSemiring.toNonUnitalNonAssocSemiring.{u1} R (NonUnitalCommSemiring.toNonUnitalSemiring.{u1} R _inst_1)))) (MulOpposite.hasMul.{u1} R (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalSemiring.toNonUnitalNonAssocSemiring.{u1} R (NonUnitalCommSemiring.toNonUnitalSemiring.{u1} R _inst_1))))) (MulOpposite.hasAdd.{u1} R (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalSemiring.toNonUnitalNonAssocSemiring.{u1} R (NonUnitalCommSemiring.toNonUnitalSemiring.{u1} R _inst_1)))))
 but is expected to have type
-  forall (R : Type.{u1}) [_inst_1 : NonUnitalCommSemiring.{u1} R], RingEquiv.{u1, u1} R (MulOpposite.{u1} R) (NonUnitalNonAssocSemiring.toMul.{u1} R (NonUnitalSemiring.toNonUnitalNonAssocSemiring.{u1} R (NonUnitalCommSemiring.toNonUnitalSemiring.{u1} R _inst_1))) (MulOpposite.instMulMulOpposite.{u1} R (NonUnitalNonAssocSemiring.toMul.{u1} R (NonUnitalSemiring.toNonUnitalNonAssocSemiring.{u1} R (NonUnitalCommSemiring.toNonUnitalSemiring.{u1} R _inst_1)))) (Distrib.toAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalSemiring.toNonUnitalNonAssocSemiring.{u1} R (NonUnitalCommSemiring.toNonUnitalSemiring.{u1} R _inst_1)))) (MulOpposite.instAddMulOpposite.{u1} R (Distrib.toAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalSemiring.toNonUnitalNonAssocSemiring.{u1} R (NonUnitalCommSemiring.toNonUnitalSemiring.{u1} R _inst_1)))))
+  forall (R : Type.{u1}) [_inst_1 : NonUnitalCommSemiring.{u1} R], RingEquiv.{u1, u1} R (MulOpposite.{u1} R) (NonUnitalNonAssocSemiring.toMul.{u1} R (NonUnitalSemiring.toNonUnitalNonAssocSemiring.{u1} R (NonUnitalCommSemiring.toNonUnitalSemiring.{u1} R _inst_1))) (MulOpposite.mul.{u1} R (NonUnitalNonAssocSemiring.toMul.{u1} R (NonUnitalSemiring.toNonUnitalNonAssocSemiring.{u1} R (NonUnitalCommSemiring.toNonUnitalSemiring.{u1} R _inst_1)))) (Distrib.toAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalSemiring.toNonUnitalNonAssocSemiring.{u1} R (NonUnitalCommSemiring.toNonUnitalSemiring.{u1} R _inst_1)))) (MulOpposite.add.{u1} R (Distrib.toAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonUnitalSemiring.toNonUnitalNonAssocSemiring.{u1} R (NonUnitalCommSemiring.toNonUnitalSemiring.{u1} R _inst_1)))))
 Case conversion may be inaccurate. Consider using '#align ring_equiv.to_opposite RingEquiv.toOppositeₓ'. -/
 /-- A non-unital commutative ring is isomorphic to its opposite. -/
 def toOpposite : R ≃+* Rᵐᵒᵖ :=

mathlib commit https://github.com/leanprover-community/mathlib/commit/57e09a1296bfb4330ddf6624f1028ba186117d82

@@ -152,17 +152,16 @@ instance : RingEquivClass (R ≃+* S) R S where
 instance : CoeFun (R ≃+* S) fun _ => R → S :=
   ⟨RingEquiv.toFun⟩
 
-/- warning: ring_equiv.to_equiv_eq_coe clashes with [anonymous] -> [anonymous]
-warning: ring_equiv.to_equiv_eq_coe -> [anonymous] is a dubious translation:
+/- warning: ring_equiv.to_equiv_eq_coe -> RingEquiv.toEquiv_eq_coe is a dubious translation:
 lean 3 declaration is
   forall {R : Type.{u1}} {S : Type.{u2}} [_inst_1 : Mul.{u1} R] [_inst_2 : Add.{u1} R] [_inst_3 : Mul.{u2} S] [_inst_4 : Add.{u2} S] (f : RingEquiv.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4), Eq.{max 1 (max (succ u1) (succ u2)) (succ u2) (succ u1)} (Equiv.{succ u1, succ u2} R S) (RingEquiv.toEquiv.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4 f) ((fun (a : Sort.{max (succ u1) (succ u2)}) (b : Sort.{max 1 (max (succ u1) (succ u2)) (succ u2) (succ u1)}) [self : HasLiftT.{max (succ u1) (succ u2), max 1 (max (succ u1) (succ u2)) (succ u2) (succ u1)} a b] => self.0) (RingEquiv.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4) (Equiv.{succ u1, succ u2} R S) (HasLiftT.mk.{max (succ u1) (succ u2), max 1 (max (succ u1) (succ u2)) (succ u2) (succ u1)} (RingEquiv.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4) (Equiv.{succ u1, succ u2} R S) (CoeTCₓ.coe.{max (succ u1) (succ u2), max 1 (max (succ u1) (succ u2)) (succ u2) (succ u1)} (RingEquiv.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4) (Equiv.{succ u1, succ u2} R S) (Equiv.hasCoeT.{succ u1, succ u2, max (succ u1) (succ u2)} R S (RingEquiv.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4) (MulEquivClass.toEquivLike.{max u1 u2, u1, u2} (RingEquiv.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4) R S _inst_1 _inst_3 (RingEquivClass.toMulEquivClass.{max u1 u2, u1, u2} (RingEquiv.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4) R S _inst_1 _inst_2 _inst_3 _inst_4 (RingEquiv.ringEquivClass.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4)))))) f)
 but is expected to have type
-  forall {R : Type.{u1}} {S : Type.{u2}}, (Nat -> R -> S) -> Nat -> (List.{u1} R) -> (List.{u2} S)
-Case conversion may be inaccurate. Consider using '#align ring_equiv.to_equiv_eq_coe [anonymous]ₓ'. -/
+  forall {R : Type.{u2}} {S : Type.{u1}} [_inst_1 : Mul.{u2} R] [_inst_2 : Mul.{u1} S] [_inst_3 : Add.{u2} R] [_inst_4 : Add.{u1} S] (f : RingEquiv.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4), Eq.{max (succ u2) (succ u1)} (Equiv.{succ u2, succ u1} R S) (RingEquiv.toEquiv.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4 f) (EquivLike.toEquiv.{succ u2, succ u1, max (succ u2) (succ u1)} R S (RingEquiv.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4) (MulEquivClass.toEquivLike.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4) R S _inst_1 _inst_2 (RingEquivClass.toMulEquivClass.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4) R S _inst_1 _inst_3 _inst_2 _inst_4 (RingEquiv.instRingEquivClassRingEquiv.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4))) f)
+Case conversion may be inaccurate. Consider using '#align ring_equiv.to_equiv_eq_coe RingEquiv.toEquiv_eq_coeₓ'. -/
 @[simp]
-theorem [anonymous] (f : R ≃+* S) : f.toEquiv = f :=
+theorem toEquiv_eq_coe (f : R ≃+* S) : f.toEquiv = f :=
   rfl
-#align ring_equiv.to_equiv_eq_coe [anonymous]
+#align ring_equiv.to_equiv_eq_coe RingEquiv.toEquiv_eq_coe
 
 /- warning: ring_equiv.to_fun_eq_coe clashes with [anonymous] -> [anonymous]
 warning: ring_equiv.to_fun_eq_coe -> [anonymous] is a dubious translation:
@@ -460,7 +459,7 @@ theorem mk_coe' (e : R ≃+* S) (f h₁ h₂ h₃ h₄) :
 lean 3 declaration is
   forall {R : Type.{u1}} {S : Type.{u2}} [_inst_1 : Mul.{u1} R] [_inst_2 : Add.{u1} R] [_inst_3 : Mul.{u2} S] [_inst_4 : Add.{u2} S] (f : R -> S) (g : S -> R) (h₁ : Function.LeftInverse.{succ u1, succ u2} R S g f) (h₂ : Function.RightInverse.{succ u1, succ u2} R S g f) (h₃ : forall (x : R) (y : R), Eq.{succ u2} S (f (HMul.hMul.{u1, u1, u1} R R R (instHMul.{u1} R _inst_1) x y)) (HMul.hMul.{u2, u2, u2} S S S (instHMul.{u2} S _inst_3) (f x) (f y))) (h₄ : forall (x : R) (y : R), Eq.{succ u2} S (f (HAdd.hAdd.{u1, u1, u1} R R R (instHAdd.{u1} R _inst_2) x y)) (HAdd.hAdd.{u2, u2, u2} S S S (instHAdd.{u2} S _inst_4) (f x) (f y))), Eq.{max (succ u2) (succ u1)} (RingEquiv.{u2, u1} S R _inst_3 _inst_4 _inst_1 _inst_2) (RingEquiv.symm.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4 (RingEquiv.mk.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4 f g h₁ h₂ h₃ h₄)) (RingEquiv.mk.{u2, u1} S R _inst_3 _inst_4 _inst_1 _inst_2 g f (RingEquiv.left_inv.{u2, u1} S R _inst_3 _inst_4 _inst_1 _inst_2 (RingEquiv.symm.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4 (RingEquiv.mk.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4 f g h₁ h₂ h₃ h₄))) (RingEquiv.right_inv.{u2, u1} S R _inst_3 _inst_4 _inst_1 _inst_2 (RingEquiv.symm.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4 (RingEquiv.mk.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4 f g h₁ h₂ h₃ h₄))) (RingEquiv.map_mul'.{u2, u1} S R _inst_3 _inst_4 _inst_1 _inst_2 (RingEquiv.symm.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4 (RingEquiv.mk.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4 f g h₁ h₂ h₃ h₄))) (RingEquiv.map_add'.{u2, u1} S R _inst_3 _inst_4 _inst_1 _inst_2 (RingEquiv.symm.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4 (RingEquiv.mk.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4 f g h₁ h₂ h₃ h₄))))
 but is expected to have type
-  forall {R : Type.{u2}} {S : Type.{u1}} [_inst_1 : Mul.{u2} R] [_inst_2 : Mul.{u1} S] [_inst_3 : Add.{u2} R] [_inst_4 : Add.{u1} S] (f : R -> S) (g : S -> R) (h₁ : Function.LeftInverse.{succ u2, succ u1} R S g f) (h₂ : Function.RightInverse.{succ u2, succ u1} R S g f) (h₃ : forall (x : R) (y : R), Eq.{succ u1} S (Equiv.toFun.{succ u2, succ u1} R S (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) (HMul.hMul.{u2, u2, u2} R R R (instHMul.{u2} R _inst_1) x y)) (HMul.hMul.{u1, u1, u1} S S S (instHMul.{u1} S _inst_2) (Equiv.toFun.{succ u2, succ u1} R S (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) x) (Equiv.toFun.{succ u2, succ u1} R S (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) y))) (h₄ : forall (x : R) (y : R), Eq.{succ u1} S (Equiv.toFun.{succ u2, succ u1} R S (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) (HAdd.hAdd.{u2, u2, u2} R R R (instHAdd.{u2} R _inst_3) x y)) (HAdd.hAdd.{u1, u1, u1} S S S (instHAdd.{u1} S _inst_4) (Equiv.toFun.{succ u2, succ u1} R S (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) x) (Equiv.toFun.{succ u2, succ u1} R S (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) y))), Eq.{max (succ u2) (succ u1)} (RingEquiv.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3) (RingEquiv.symm.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4 (RingEquiv.mk.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4 (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) h₃ h₄)) (let src._@.Mathlib.Algebra.Ring.Equiv._hyg.2590 : RingEquiv.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3 := RingEquiv.symm.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4 (RingEquiv.mk.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4 (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) h₃ h₄); RingEquiv.mk.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3 (Equiv.mk.{succ u1, succ u2} S R g f (Equiv.left_inv.{succ u1, succ u2} S R (RingEquiv.toEquiv.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3 src._@.Mathlib.Algebra.Ring.Equiv._hyg.2590)) (Equiv.right_inv.{succ u1, succ u2} S R (RingEquiv.toEquiv.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3 src._@.Mathlib.Algebra.Ring.Equiv._hyg.2590))) (RingEquiv.map_mul'.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3 src._@.Mathlib.Algebra.Ring.Equiv._hyg.2590) (RingEquiv.map_add'.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3 src._@.Mathlib.Algebra.Ring.Equiv._hyg.2590))
+  forall {R : Type.{u2}} {S : Type.{u1}} [_inst_1 : Mul.{u2} R] [_inst_2 : Mul.{u1} S] [_inst_3 : Add.{u2} R] [_inst_4 : Add.{u1} S] (f : R -> S) (g : S -> R) (h₁ : Function.LeftInverse.{succ u2, succ u1} R S g f) (h₂ : Function.RightInverse.{succ u2, succ u1} R S g f) (h₃ : forall (x : R) (y : R), Eq.{succ u1} S (Equiv.toFun.{succ u2, succ u1} R S (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) (HMul.hMul.{u2, u2, u2} R R R (instHMul.{u2} R _inst_1) x y)) (HMul.hMul.{u1, u1, u1} S S S (instHMul.{u1} S _inst_2) (Equiv.toFun.{succ u2, succ u1} R S (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) x) (Equiv.toFun.{succ u2, succ u1} R S (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) y))) (h₄ : forall (x : R) (y : R), Eq.{succ u1} S (Equiv.toFun.{succ u2, succ u1} R S (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) (HAdd.hAdd.{u2, u2, u2} R R R (instHAdd.{u2} R _inst_3) x y)) (HAdd.hAdd.{u1, u1, u1} S S S (instHAdd.{u1} S _inst_4) (Equiv.toFun.{succ u2, succ u1} R S (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) x) (Equiv.toFun.{succ u2, succ u1} R S (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) y))), Eq.{max (succ u2) (succ u1)} (RingEquiv.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3) (RingEquiv.symm.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4 (RingEquiv.mk.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4 (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) h₃ h₄)) (let src._@.Mathlib.Algebra.Ring.Equiv._hyg.2626 : RingEquiv.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3 := RingEquiv.symm.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4 (RingEquiv.mk.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4 (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) h₃ h₄); RingEquiv.mk.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3 (Equiv.mk.{succ u1, succ u2} S R g f (Equiv.left_inv.{succ u1, succ u2} S R (RingEquiv.toEquiv.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3 src._@.Mathlib.Algebra.Ring.Equiv._hyg.2626)) (Equiv.right_inv.{succ u1, succ u2} S R (RingEquiv.toEquiv.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3 src._@.Mathlib.Algebra.Ring.Equiv._hyg.2626))) (RingEquiv.map_mul'.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3 src._@.Mathlib.Algebra.Ring.Equiv._hyg.2626) (RingEquiv.map_add'.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3 src._@.Mathlib.Algebra.Ring.Equiv._hyg.2626))
 Case conversion may be inaccurate. Consider using '#align ring_equiv.symm_mk RingEquiv.symm_mkₓ'. -/
 @[simp]
 theorem symm_mk (f : R → S) (g h₁ h₂ h₃ h₄) :

mathlib commit https://github.com/leanprover-community/mathlib/commit/290a7ba01fbcab1b64757bdaa270d28f4dcede35

@@ -176,17 +176,16 @@ theorem [anonymous] (f : R ≃+* S) : f.toFun = f :=
   rfl
 #align ring_equiv.to_fun_eq_coe [anonymous]
 
-/- warning: ring_equiv.coe_to_equiv clashes with [anonymous] -> [anonymous]
-warning: ring_equiv.coe_to_equiv -> [anonymous] is a dubious translation:
+/- warning: ring_equiv.coe_to_equiv -> RingEquiv.coe_toEquiv is a dubious translation:
 lean 3 declaration is
   forall {R : Type.{u1}} {S : Type.{u2}} [_inst_1 : Mul.{u1} R] [_inst_2 : Add.{u1} R] [_inst_3 : Mul.{u2} S] [_inst_4 : Add.{u2} S] (f : RingEquiv.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4), Eq.{max (succ u1) (succ u2)} (R -> S) (coeFn.{max 1 (max (succ u1) (succ u2)) (succ u2) (succ u1), max (succ u1) (succ u2)} (Equiv.{succ u1, succ u2} R S) (fun (_x : Equiv.{succ u1, succ u2} R S) => R -> S) (Equiv.hasCoeToFun.{succ u1, succ u2} R S) ((fun (a : Sort.{max (succ u1) (succ u2)}) (b : Sort.{max 1 (max (succ u1) (succ u2)) (succ u2) (succ u1)}) [self : HasLiftT.{max (succ u1) (succ u2), max 1 (max (succ u1) (succ u2)) (succ u2) (succ u1)} a b] => self.0) (RingEquiv.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4) (Equiv.{succ u1, succ u2} R S) (HasLiftT.mk.{max (succ u1) (succ u2), max 1 (max (succ u1) (succ u2)) (succ u2) (succ u1)} (RingEquiv.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4) (Equiv.{succ u1, succ u2} R S) (CoeTCₓ.coe.{max (succ u1) (succ u2), max 1 (max (succ u1) (succ u2)) (succ u2) (succ u1)} (RingEquiv.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4) (Equiv.{succ u1, succ u2} R S) (Equiv.hasCoeT.{succ u1, succ u2, max (succ u1) (succ u2)} R S (RingEquiv.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4) (MulEquivClass.toEquivLike.{max u1 u2, u1, u2} (RingEquiv.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4) R S _inst_1 _inst_3 (RingEquivClass.toMulEquivClass.{max u1 u2, u1, u2} (RingEquiv.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4) R S _inst_1 _inst_2 _inst_3 _inst_4 (RingEquiv.ringEquivClass.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4)))))) f)) (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingEquiv.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4) (fun (_x : RingEquiv.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4) => R -> S) (RingEquiv.hasCoeToFun.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4) f)
 but is expected to have type
-  forall {R : Type.{u1}} {S : Type.{u2}}, (Nat -> R -> S) -> Nat -> (List.{u1} R) -> (List.{u2} S)
-Case conversion may be inaccurate. Consider using '#align ring_equiv.coe_to_equiv [anonymous]ₓ'. -/
+  forall {R : Type.{u2}} {S : Type.{u1}} [_inst_1 : Mul.{u2} R] [_inst_2 : Mul.{u1} S] [_inst_3 : Add.{u2} R] [_inst_4 : Add.{u1} S] (f : RingEquiv.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4), Eq.{max (succ u2) (succ u1)} (forall (ᾰ : R), (fun (x._@.Mathlib.Logic.Equiv.Defs._hyg.808 : R) => S) ᾰ) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (Equiv.{succ u2, succ u1} R S) R (fun (_x : R) => (fun (x._@.Mathlib.Logic.Equiv.Defs._hyg.808 : R) => S) _x) (Equiv.instFunLikeEquiv.{succ u2, succ u1} R S) (EquivLike.toEquiv.{succ u2, succ u1, max (succ u2) (succ u1)} R S (RingEquiv.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4) (MulEquivClass.toEquivLike.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4) R S _inst_1 _inst_2 (RingEquivClass.toMulEquivClass.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4) R S _inst_1 _inst_3 _inst_2 _inst_4 (RingEquiv.instRingEquivClassRingEquiv.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4))) f)) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4) R (fun (_x : R) => (fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) _x) (EmbeddingLike.toFunLike.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4) R S (EquivLike.toEmbeddingLike.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4) R S (MulEquivClass.toEquivLike.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4) R S _inst_1 _inst_2 (RingEquivClass.toMulEquivClass.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4) R S _inst_1 _inst_3 _inst_2 _inst_4 (RingEquiv.instRingEquivClassRingEquiv.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4))))) f)
+Case conversion may be inaccurate. Consider using '#align ring_equiv.coe_to_equiv RingEquiv.coe_toEquivₓ'. -/
 @[simp]
-theorem [anonymous] (f : R ≃+* S) : ⇑(f : R ≃ S) = f :=
+theorem coe_toEquiv (f : R ≃+* S) : ⇑(f : R ≃ S) = f :=
   rfl
-#align ring_equiv.coe_to_equiv [anonymous]
+#align ring_equiv.coe_to_equiv RingEquiv.coe_toEquiv
 
 /- warning: ring_equiv.map_mul -> RingEquiv.map_mul is a dubious translation:
 lean 3 declaration is
@@ -223,17 +222,10 @@ theorem ext {f g : R ≃+* S} (h : ∀ x, f x = g x) : f = g :=
   FunLike.ext f g h
 #align ring_equiv.ext RingEquiv.ext
 
-/- warning: ring_equiv.coe_mk clashes with [anonymous] -> [anonymous]
-warning: ring_equiv.coe_mk -> [anonymous] is a dubious translation:
-lean 3 declaration is
-  forall {R : Type.{u1}} {S : Type.{u2}} [_inst_1 : Mul.{u1} R] [_inst_2 : Add.{u1} R] [_inst_3 : Mul.{u2} S] [_inst_4 : Add.{u2} S] (e : R -> S) (e' : S -> R) (h₁ : Function.LeftInverse.{succ u1, succ u2} R S e' e) (h₂ : Function.RightInverse.{succ u1, succ u2} R S e' e) (h₃ : forall (x : R) (y : R), Eq.{succ u2} S (e (HMul.hMul.{u1, u1, u1} R R R (instHMul.{u1} R _inst_1) x y)) (HMul.hMul.{u2, u2, u2} S S S (instHMul.{u2} S _inst_3) (e x) (e y))) (h₄ : forall (x : R) (y : R), Eq.{succ u2} S (e (HAdd.hAdd.{u1, u1, u1} R R R (instHAdd.{u1} R _inst_2) x y)) (HAdd.hAdd.{u2, u2, u2} S S S (instHAdd.{u2} S _inst_4) (e x) (e y))), Eq.{max (succ u1) (succ u2)} (R -> S) (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingEquiv.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4) (fun (_x : RingEquiv.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4) => R -> S) (RingEquiv.hasCoeToFun.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4) (RingEquiv.mk.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4 e e' h₁ h₂ h₃ h₄)) e
-but is expected to have type
-  forall {R : Type.{u1}} {S : Type.{u2}}, (Nat -> R -> S) -> Nat -> (List.{u1} R) -> (List.{u2} S)
-Case conversion may be inaccurate. Consider using '#align ring_equiv.coe_mk [anonymous]ₓ'. -/
 @[simp]
-theorem [anonymous] (e e' h₁ h₂ h₃ h₄) : ⇑(⟨e, e', h₁, h₂, h₃, h₄⟩ : R ≃+* S) = e :=
+theorem coe_mk (e e' h₁ h₂ h₃ h₄) : ⇑(⟨e, e', h₁, h₂, h₃, h₄⟩ : R ≃+* S) = e :=
   rfl
-#align ring_equiv.coe_mk [anonymous]
+#align ring_equiv.coe_mk RingEquiv.coe_mkₓ
 
 /- warning: ring_equiv.mk_coe -> RingEquiv.mk_coe is a dubious translation:
 lean 3 declaration is
@@ -468,7 +460,7 @@ theorem mk_coe' (e : R ≃+* S) (f h₁ h₂ h₃ h₄) :
 lean 3 declaration is
   forall {R : Type.{u1}} {S : Type.{u2}} [_inst_1 : Mul.{u1} R] [_inst_2 : Add.{u1} R] [_inst_3 : Mul.{u2} S] [_inst_4 : Add.{u2} S] (f : R -> S) (g : S -> R) (h₁ : Function.LeftInverse.{succ u1, succ u2} R S g f) (h₂ : Function.RightInverse.{succ u1, succ u2} R S g f) (h₃ : forall (x : R) (y : R), Eq.{succ u2} S (f (HMul.hMul.{u1, u1, u1} R R R (instHMul.{u1} R _inst_1) x y)) (HMul.hMul.{u2, u2, u2} S S S (instHMul.{u2} S _inst_3) (f x) (f y))) (h₄ : forall (x : R) (y : R), Eq.{succ u2} S (f (HAdd.hAdd.{u1, u1, u1} R R R (instHAdd.{u1} R _inst_2) x y)) (HAdd.hAdd.{u2, u2, u2} S S S (instHAdd.{u2} S _inst_4) (f x) (f y))), Eq.{max (succ u2) (succ u1)} (RingEquiv.{u2, u1} S R _inst_3 _inst_4 _inst_1 _inst_2) (RingEquiv.symm.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4 (RingEquiv.mk.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4 f g h₁ h₂ h₃ h₄)) (RingEquiv.mk.{u2, u1} S R _inst_3 _inst_4 _inst_1 _inst_2 g f (RingEquiv.left_inv.{u2, u1} S R _inst_3 _inst_4 _inst_1 _inst_2 (RingEquiv.symm.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4 (RingEquiv.mk.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4 f g h₁ h₂ h₃ h₄))) (RingEquiv.right_inv.{u2, u1} S R _inst_3 _inst_4 _inst_1 _inst_2 (RingEquiv.symm.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4 (RingEquiv.mk.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4 f g h₁ h₂ h₃ h₄))) (RingEquiv.map_mul'.{u2, u1} S R _inst_3 _inst_4 _inst_1 _inst_2 (RingEquiv.symm.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4 (RingEquiv.mk.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4 f g h₁ h₂ h₃ h₄))) (RingEquiv.map_add'.{u2, u1} S R _inst_3 _inst_4 _inst_1 _inst_2 (RingEquiv.symm.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4 (RingEquiv.mk.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4 f g h₁ h₂ h₃ h₄))))
 but is expected to have type
-  forall {R : Type.{u2}} {S : Type.{u1}} [_inst_1 : Mul.{u2} R] [_inst_2 : Mul.{u1} S] [_inst_3 : Add.{u2} R] [_inst_4 : Add.{u1} S] (f : R -> S) (g : S -> R) (h₁ : Function.LeftInverse.{succ u2, succ u1} R S g f) (h₂ : Function.RightInverse.{succ u2, succ u1} R S g f) (h₃ : forall (x : R) (y : R), Eq.{succ u1} S (Equiv.toFun.{succ u2, succ u1} R S (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) (HMul.hMul.{u2, u2, u2} R R R (instHMul.{u2} R _inst_1) x y)) (HMul.hMul.{u1, u1, u1} S S S (instHMul.{u1} S _inst_2) (Equiv.toFun.{succ u2, succ u1} R S (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) x) (Equiv.toFun.{succ u2, succ u1} R S (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) y))) (h₄ : forall (x : R) (y : R), Eq.{succ u1} S (Equiv.toFun.{succ u2, succ u1} R S (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) (HAdd.hAdd.{u2, u2, u2} R R R (instHAdd.{u2} R _inst_3) x y)) (HAdd.hAdd.{u1, u1, u1} S S S (instHAdd.{u1} S _inst_4) (Equiv.toFun.{succ u2, succ u1} R S (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) x) (Equiv.toFun.{succ u2, succ u1} R S (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) y))), Eq.{max (succ u2) (succ u1)} (RingEquiv.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3) (RingEquiv.symm.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4 (RingEquiv.mk.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4 (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) h₃ h₄)) (let src._@.Mathlib.Algebra.Ring.Equiv._hyg.2496 : RingEquiv.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3 := RingEquiv.symm.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4 (RingEquiv.mk.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4 (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) h₃ h₄); RingEquiv.mk.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3 (Equiv.mk.{succ u1, succ u2} S R g f (Equiv.left_inv.{succ u1, succ u2} S R (RingEquiv.toEquiv.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3 src._@.Mathlib.Algebra.Ring.Equiv._hyg.2496)) (Equiv.right_inv.{succ u1, succ u2} S R (RingEquiv.toEquiv.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3 src._@.Mathlib.Algebra.Ring.Equiv._hyg.2496))) (RingEquiv.map_mul'.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3 src._@.Mathlib.Algebra.Ring.Equiv._hyg.2496) (RingEquiv.map_add'.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3 src._@.Mathlib.Algebra.Ring.Equiv._hyg.2496))
+  forall {R : Type.{u2}} {S : Type.{u1}} [_inst_1 : Mul.{u2} R] [_inst_2 : Mul.{u1} S] [_inst_3 : Add.{u2} R] [_inst_4 : Add.{u1} S] (f : R -> S) (g : S -> R) (h₁ : Function.LeftInverse.{succ u2, succ u1} R S g f) (h₂ : Function.RightInverse.{succ u2, succ u1} R S g f) (h₃ : forall (x : R) (y : R), Eq.{succ u1} S (Equiv.toFun.{succ u2, succ u1} R S (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) (HMul.hMul.{u2, u2, u2} R R R (instHMul.{u2} R _inst_1) x y)) (HMul.hMul.{u1, u1, u1} S S S (instHMul.{u1} S _inst_2) (Equiv.toFun.{succ u2, succ u1} R S (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) x) (Equiv.toFun.{succ u2, succ u1} R S (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) y))) (h₄ : forall (x : R) (y : R), Eq.{succ u1} S (Equiv.toFun.{succ u2, succ u1} R S (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) (HAdd.hAdd.{u2, u2, u2} R R R (instHAdd.{u2} R _inst_3) x y)) (HAdd.hAdd.{u1, u1, u1} S S S (instHAdd.{u1} S _inst_4) (Equiv.toFun.{succ u2, succ u1} R S (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) x) (Equiv.toFun.{succ u2, succ u1} R S (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) y))), Eq.{max (succ u2) (succ u1)} (RingEquiv.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3) (RingEquiv.symm.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4 (RingEquiv.mk.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4 (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) h₃ h₄)) (let src._@.Mathlib.Algebra.Ring.Equiv._hyg.2590 : RingEquiv.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3 := RingEquiv.symm.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4 (RingEquiv.mk.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4 (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) h₃ h₄); RingEquiv.mk.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3 (Equiv.mk.{succ u1, succ u2} S R g f (Equiv.left_inv.{succ u1, succ u2} S R (RingEquiv.toEquiv.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3 src._@.Mathlib.Algebra.Ring.Equiv._hyg.2590)) (Equiv.right_inv.{succ u1, succ u2} S R (RingEquiv.toEquiv.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3 src._@.Mathlib.Algebra.Ring.Equiv._hyg.2590))) (RingEquiv.map_mul'.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3 src._@.Mathlib.Algebra.Ring.Equiv._hyg.2590) (RingEquiv.map_add'.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3 src._@.Mathlib.Algebra.Ring.Equiv._hyg.2590))
 Case conversion may be inaccurate. Consider using '#align ring_equiv.symm_mk RingEquiv.symm_mkₓ'. -/
 @[simp]
 theorem symm_mk (f : R → S) (g h₁ h₂ h₃ h₄) :

mathlib commit https://github.com/leanprover-community/mathlib/commit/3180fab693e2cee3bff62675571264cb8778b212

@@ -468,7 +468,7 @@ theorem mk_coe' (e : R ≃+* S) (f h₁ h₂ h₃ h₄) :
 lean 3 declaration is
   forall {R : Type.{u1}} {S : Type.{u2}} [_inst_1 : Mul.{u1} R] [_inst_2 : Add.{u1} R] [_inst_3 : Mul.{u2} S] [_inst_4 : Add.{u2} S] (f : R -> S) (g : S -> R) (h₁ : Function.LeftInverse.{succ u1, succ u2} R S g f) (h₂ : Function.RightInverse.{succ u1, succ u2} R S g f) (h₃ : forall (x : R) (y : R), Eq.{succ u2} S (f (HMul.hMul.{u1, u1, u1} R R R (instHMul.{u1} R _inst_1) x y)) (HMul.hMul.{u2, u2, u2} S S S (instHMul.{u2} S _inst_3) (f x) (f y))) (h₄ : forall (x : R) (y : R), Eq.{succ u2} S (f (HAdd.hAdd.{u1, u1, u1} R R R (instHAdd.{u1} R _inst_2) x y)) (HAdd.hAdd.{u2, u2, u2} S S S (instHAdd.{u2} S _inst_4) (f x) (f y))), Eq.{max (succ u2) (succ u1)} (RingEquiv.{u2, u1} S R _inst_3 _inst_4 _inst_1 _inst_2) (RingEquiv.symm.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4 (RingEquiv.mk.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4 f g h₁ h₂ h₃ h₄)) (RingEquiv.mk.{u2, u1} S R _inst_3 _inst_4 _inst_1 _inst_2 g f (RingEquiv.left_inv.{u2, u1} S R _inst_3 _inst_4 _inst_1 _inst_2 (RingEquiv.symm.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4 (RingEquiv.mk.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4 f g h₁ h₂ h₃ h₄))) (RingEquiv.right_inv.{u2, u1} S R _inst_3 _inst_4 _inst_1 _inst_2 (RingEquiv.symm.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4 (RingEquiv.mk.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4 f g h₁ h₂ h₃ h₄))) (RingEquiv.map_mul'.{u2, u1} S R _inst_3 _inst_4 _inst_1 _inst_2 (RingEquiv.symm.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4 (RingEquiv.mk.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4 f g h₁ h₂ h₃ h₄))) (RingEquiv.map_add'.{u2, u1} S R _inst_3 _inst_4 _inst_1 _inst_2 (RingEquiv.symm.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4 (RingEquiv.mk.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4 f g h₁ h₂ h₃ h₄))))
 but is expected to have type
-  forall {R : Type.{u2}} {S : Type.{u1}} [_inst_1 : Mul.{u2} R] [_inst_2 : Mul.{u1} S] [_inst_3 : Add.{u2} R] [_inst_4 : Add.{u1} S] (f : R -> S) (g : S -> R) (h₁ : Function.LeftInverse.{succ u2, succ u1} R S g f) (h₂ : Function.RightInverse.{succ u2, succ u1} R S g f) (h₃ : forall (x : R) (y : R), Eq.{succ u1} S (Equiv.toFun.{succ u2, succ u1} R S (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) (HMul.hMul.{u2, u2, u2} R R R (instHMul.{u2} R _inst_1) x y)) (HMul.hMul.{u1, u1, u1} S S S (instHMul.{u1} S _inst_2) (Equiv.toFun.{succ u2, succ u1} R S (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) x) (Equiv.toFun.{succ u2, succ u1} R S (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) y))) (h₄ : forall (x : R) (y : R), Eq.{succ u1} S (Equiv.toFun.{succ u2, succ u1} R S (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) (HAdd.hAdd.{u2, u2, u2} R R R (instHAdd.{u2} R _inst_3) x y)) (HAdd.hAdd.{u1, u1, u1} S S S (instHAdd.{u1} S _inst_4) (Equiv.toFun.{succ u2, succ u1} R S (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) x) (Equiv.toFun.{succ u2, succ u1} R S (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) y))), Eq.{max (succ u2) (succ u1)} (RingEquiv.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3) (RingEquiv.symm.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4 (RingEquiv.mk.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4 (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) h₃ h₄)) (let src._@.Mathlib.Algebra.Ring.Equiv._hyg.2470 : RingEquiv.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3 := RingEquiv.symm.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4 (RingEquiv.mk.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4 (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) h₃ h₄); RingEquiv.mk.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3 (Equiv.mk.{succ u1, succ u2} S R g f (Equiv.left_inv.{succ u1, succ u2} S R (RingEquiv.toEquiv.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3 src._@.Mathlib.Algebra.Ring.Equiv._hyg.2470)) (Equiv.right_inv.{succ u1, succ u2} S R (RingEquiv.toEquiv.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3 src._@.Mathlib.Algebra.Ring.Equiv._hyg.2470))) (RingEquiv.map_mul'.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3 src._@.Mathlib.Algebra.Ring.Equiv._hyg.2470) (RingEquiv.map_add'.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3 src._@.Mathlib.Algebra.Ring.Equiv._hyg.2470))
+  forall {R : Type.{u2}} {S : Type.{u1}} [_inst_1 : Mul.{u2} R] [_inst_2 : Mul.{u1} S] [_inst_3 : Add.{u2} R] [_inst_4 : Add.{u1} S] (f : R -> S) (g : S -> R) (h₁ : Function.LeftInverse.{succ u2, succ u1} R S g f) (h₂ : Function.RightInverse.{succ u2, succ u1} R S g f) (h₃ : forall (x : R) (y : R), Eq.{succ u1} S (Equiv.toFun.{succ u2, succ u1} R S (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) (HMul.hMul.{u2, u2, u2} R R R (instHMul.{u2} R _inst_1) x y)) (HMul.hMul.{u1, u1, u1} S S S (instHMul.{u1} S _inst_2) (Equiv.toFun.{succ u2, succ u1} R S (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) x) (Equiv.toFun.{succ u2, succ u1} R S (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) y))) (h₄ : forall (x : R) (y : R), Eq.{succ u1} S (Equiv.toFun.{succ u2, succ u1} R S (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) (HAdd.hAdd.{u2, u2, u2} R R R (instHAdd.{u2} R _inst_3) x y)) (HAdd.hAdd.{u1, u1, u1} S S S (instHAdd.{u1} S _inst_4) (Equiv.toFun.{succ u2, succ u1} R S (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) x) (Equiv.toFun.{succ u2, succ u1} R S (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) y))), Eq.{max (succ u2) (succ u1)} (RingEquiv.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3) (RingEquiv.symm.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4 (RingEquiv.mk.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4 (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) h₃ h₄)) (let src._@.Mathlib.Algebra.Ring.Equiv._hyg.2496 : RingEquiv.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3 := RingEquiv.symm.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4 (RingEquiv.mk.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4 (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) h₃ h₄); RingEquiv.mk.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3 (Equiv.mk.{succ u1, succ u2} S R g f (Equiv.left_inv.{succ u1, succ u2} S R (RingEquiv.toEquiv.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3 src._@.Mathlib.Algebra.Ring.Equiv._hyg.2496)) (Equiv.right_inv.{succ u1, succ u2} S R (RingEquiv.toEquiv.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3 src._@.Mathlib.Algebra.Ring.Equiv._hyg.2496))) (RingEquiv.map_mul'.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3 src._@.Mathlib.Algebra.Ring.Equiv._hyg.2496) (RingEquiv.map_add'.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3 src._@.Mathlib.Algebra.Ring.Equiv._hyg.2496))
 Case conversion may be inaccurate. Consider using '#align ring_equiv.symm_mk RingEquiv.symm_mkₓ'. -/
 @[simp]
 theorem symm_mk (f : R → S) (g h₁ h₂ h₃ h₄) :
@@ -734,7 +734,7 @@ theorem map_ne_zero_iff : f x ≠ 0 ↔ x ≠ 0 :=
 lean 3 declaration is
   forall {F : Type.{u1}} {R : Type.{u2}} {S : Type.{u3}} [_inst_1 : NonUnitalNonAssocSemiring.{u2} R] [_inst_2 : NonUnitalNonAssocSemiring.{u3} S] [_inst_3 : NonUnitalRingHomClass.{u1, u2, u3} F R S _inst_1 _inst_2] (f : F), (Function.Bijective.{succ u2, succ u3} R S (coeFn.{succ u1, max (succ u2) (succ u3)} F (fun (_x : F) => R -> S) (FunLike.hasCoeToFun.{succ u1, succ u2, succ u3} F R (fun (_x : R) => S) (MulHomClass.toFunLike.{u1, u2, u3} F R S (Distrib.toHasMul.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toHasMul.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2)) (NonUnitalRingHomClass.toMulHomClass.{u1, u2, u3} F R S _inst_1 _inst_2 _inst_3))) f)) -> (RingEquiv.{u2, u3} R S (Distrib.toHasMul.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toHasAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toHasMul.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2)) (Distrib.toHasAdd.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2)))
 but is expected to have type
-  forall {F : Type.{u1}} {R : Type.{u2}} {S : Type.{u3}} [_inst_1 : NonUnitalNonAssocSemiring.{u2} R] [_inst_2 : NonUnitalNonAssocSemiring.{u3} S] [_inst_3 : NonUnitalRingHomClass.{u1, u2, u3} F R S _inst_1 _inst_2] (f : F), (Function.Bijective.{succ u2, succ u3} R S (FunLike.coe.{succ u1, succ u2, succ u3} F R (fun (_x : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2372 : R) => S) _x) (MulHomClass.toFunLike.{u1, u2, u3} F R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u3} S _inst_2) (NonUnitalRingHomClass.toMulHomClass.{u1, u2, u3} F R S _inst_1 _inst_2 _inst_3)) f)) -> (RingEquiv.{u2, u3} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u3} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2)))
+  forall {F : Type.{u1}} {R : Type.{u2}} {S : Type.{u3}} [_inst_1 : NonUnitalNonAssocSemiring.{u2} R] [_inst_2 : NonUnitalNonAssocSemiring.{u3} S] [_inst_3 : NonUnitalRingHomClass.{u1, u2, u3} F R S _inst_1 _inst_2] (f : F), (Function.Bijective.{succ u2, succ u3} R S (FunLike.coe.{succ u1, succ u2, succ u3} F R (fun (_x : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : R) => S) _x) (MulHomClass.toFunLike.{u1, u2, u3} F R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u3} S _inst_2) (NonUnitalRingHomClass.toMulHomClass.{u1, u2, u3} F R S _inst_1 _inst_2 _inst_3)) f)) -> (RingEquiv.{u2, u3} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u3} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2)))
 Case conversion may be inaccurate. Consider using '#align ring_equiv.of_bijective RingEquiv.ofBijectiveₓ'. -/
 /-- Produce a ring isomorphism from a bijective ring homomorphism. -/
 noncomputable def ofBijective [NonUnitalRingHomClass F R S] (f : F) (hf : Function.Bijective f) :
@@ -748,7 +748,7 @@ noncomputable def ofBijective [NonUnitalRingHomClass F R S] (f : F) (hf : Functi
 lean 3 declaration is
   forall {F : Type.{u1}} {R : Type.{u2}} {S : Type.{u3}} [_inst_1 : NonUnitalNonAssocSemiring.{u2} R] [_inst_2 : NonUnitalNonAssocSemiring.{u3} S] [_inst_3 : NonUnitalRingHomClass.{u1, u2, u3} F R S _inst_1 _inst_2] (f : F) (hf : Function.Bijective.{succ u2, succ u3} R S (coeFn.{succ u1, max (succ u2) (succ u3)} F (fun (_x : F) => R -> S) (FunLike.hasCoeToFun.{succ u1, succ u2, succ u3} F R (fun (_x : R) => S) (MulHomClass.toFunLike.{u1, u2, u3} F R S (Distrib.toHasMul.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toHasMul.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2)) (NonUnitalRingHomClass.toMulHomClass.{u1, u2, u3} F R S _inst_1 _inst_2 _inst_3))) f)), Eq.{max (succ u2) (succ u3)} ((fun (_x : RingEquiv.{u2, u3} R S (Distrib.toHasMul.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toHasAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toHasMul.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2)) (Distrib.toHasAdd.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2))) => R -> S) (RingEquiv.ofBijective.{u1, u2, u3} F R S _inst_1 _inst_2 _inst_3 f hf)) (coeFn.{max (succ u2) (succ u3), max (succ u2) (succ u3)} (RingEquiv.{u2, u3} R S (Distrib.toHasMul.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toHasAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toHasMul.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2)) (Distrib.toHasAdd.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2))) (fun (_x : RingEquiv.{u2, u3} R S (Distrib.toHasMul.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toHasAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toHasMul.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2)) (Distrib.toHasAdd.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2))) => R -> S) (RingEquiv.hasCoeToFun.{u2, u3} R S (Distrib.toHasMul.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toHasAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toHasMul.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2)) (Distrib.toHasAdd.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2))) (RingEquiv.ofBijective.{u1, u2, u3} F R S _inst_1 _inst_2 _inst_3 f hf)) (coeFn.{succ u1, max (succ u2) (succ u3)} F (fun (_x : F) => R -> S) (FunLike.hasCoeToFun.{succ u1, succ u2, succ u3} F R (fun (_x : R) => S) (MulHomClass.toFunLike.{u1, u2, u3} F R S (Distrib.toHasMul.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toHasMul.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2)) (NonUnitalRingHomClass.toMulHomClass.{u1, u2, u3} F R S _inst_1 _inst_2 _inst_3))) f)
 but is expected to have type
-  forall {F : Type.{u3}} {R : Type.{u2}} {S : Type.{u1}} [_inst_1 : NonUnitalNonAssocSemiring.{u2} R] [_inst_2 : NonUnitalNonAssocSemiring.{u1} S] [_inst_3 : NonUnitalRingHomClass.{u3, u2, u1} F R S _inst_1 _inst_2] (f : F) (hf : Function.Bijective.{succ u2, succ u1} R S (FunLike.coe.{succ u3, succ u2, succ u1} F R (fun (_x : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2372 : R) => S) _x) (MulHomClass.toFunLike.{u3, u2, u1} F R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (NonUnitalRingHomClass.toMulHomClass.{u3, u2, u1} F R S _inst_1 _inst_2 _inst_3)) f)), Eq.{max (succ u2) (succ u1)} (forall (a : R), (fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) a) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R (fun (_x : R) => (fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) _x) (EmbeddingLike.toFunLike.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (EquivLike.toEmbeddingLike.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (MulEquivClass.toEquivLike.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (RingEquivClass.toMulEquivClass.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2)) (RingEquiv.instRingEquivClassRingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))))))) (RingEquiv.ofBijective.{u3, u2, u1} F R S _inst_1 _inst_2 _inst_3 f hf)) (FunLike.coe.{succ u3, succ u2, succ u1} F R (fun (_x : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2372 : R) => S) _x) (MulHomClass.toFunLike.{u3, u2, u1} F R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (NonUnitalRingHomClass.toMulHomClass.{u3, u2, u1} F R S _inst_1 _inst_2 _inst_3)) f)
+  forall {F : Type.{u3}} {R : Type.{u2}} {S : Type.{u1}} [_inst_1 : NonUnitalNonAssocSemiring.{u2} R] [_inst_2 : NonUnitalNonAssocSemiring.{u1} S] [_inst_3 : NonUnitalRingHomClass.{u3, u2, u1} F R S _inst_1 _inst_2] (f : F) (hf : Function.Bijective.{succ u2, succ u1} R S (FunLike.coe.{succ u3, succ u2, succ u1} F R (fun (_x : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : R) => S) _x) (MulHomClass.toFunLike.{u3, u2, u1} F R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (NonUnitalRingHomClass.toMulHomClass.{u3, u2, u1} F R S _inst_1 _inst_2 _inst_3)) f)), Eq.{max (succ u2) (succ u1)} (forall (a : R), (fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) a) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R (fun (_x : R) => (fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) _x) (EmbeddingLike.toFunLike.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (EquivLike.toEmbeddingLike.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (MulEquivClass.toEquivLike.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (RingEquivClass.toMulEquivClass.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2)) (RingEquiv.instRingEquivClassRingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))))))) (RingEquiv.ofBijective.{u3, u2, u1} F R S _inst_1 _inst_2 _inst_3 f hf)) (FunLike.coe.{succ u3, succ u2, succ u1} F R (fun (_x : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : R) => S) _x) (MulHomClass.toFunLike.{u3, u2, u1} F R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (NonUnitalRingHomClass.toMulHomClass.{u3, u2, u1} F R S _inst_1 _inst_2 _inst_3)) f)
 Case conversion may be inaccurate. Consider using '#align ring_equiv.coe_of_bijective RingEquiv.coe_ofBijectiveₓ'. -/
 @[simp]
 theorem coe_ofBijective [NonUnitalRingHomClass F R S] (f : F) (hf : Function.Bijective f) :
@@ -760,7 +760,7 @@ theorem coe_ofBijective [NonUnitalRingHomClass F R S] (f : F) (hf : Function.Bij
 lean 3 declaration is
   forall {F : Type.{u1}} {R : Type.{u2}} {S : Type.{u3}} [_inst_1 : NonUnitalNonAssocSemiring.{u2} R] [_inst_2 : NonUnitalNonAssocSemiring.{u3} S] [_inst_3 : NonUnitalRingHomClass.{u1, u2, u3} F R S _inst_1 _inst_2] (f : F) (hf : Function.Bijective.{succ u2, succ u3} R S (coeFn.{succ u1, max (succ u2) (succ u3)} F (fun (_x : F) => R -> S) (FunLike.hasCoeToFun.{succ u1, succ u2, succ u3} F R (fun (_x : R) => S) (MulHomClass.toFunLike.{u1, u2, u3} F R S (Distrib.toHasMul.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toHasMul.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2)) (NonUnitalRingHomClass.toMulHomClass.{u1, u2, u3} F R S _inst_1 _inst_2 _inst_3))) f)) (x : R), Eq.{succ u3} S (coeFn.{max (succ u2) (succ u3), max (succ u2) (succ u3)} (RingEquiv.{u2, u3} R S (Distrib.toHasMul.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toHasAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toHasMul.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2)) (Distrib.toHasAdd.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2))) (fun (_x : RingEquiv.{u2, u3} R S (Distrib.toHasMul.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toHasAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toHasMul.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2)) (Distrib.toHasAdd.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2))) => R -> S) (RingEquiv.hasCoeToFun.{u2, u3} R S (Distrib.toHasMul.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toHasAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toHasMul.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2)) (Distrib.toHasAdd.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2))) (RingEquiv.ofBijective.{u1, u2, u3} F R S _inst_1 _inst_2 _inst_3 f hf) x) (coeFn.{succ u1, max (succ u2) (succ u3)} F (fun (_x : F) => R -> S) (FunLike.hasCoeToFun.{succ u1, succ u2, succ u3} F R (fun (_x : R) => S) (MulHomClass.toFunLike.{u1, u2, u3} F R S (Distrib.toHasMul.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toHasMul.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2)) (NonUnitalRingHomClass.toMulHomClass.{u1, u2, u3} F R S _inst_1 _inst_2 _inst_3))) f x)
 but is expected to have type
-  forall {F : Type.{u3}} {R : Type.{u2}} {S : Type.{u1}} [_inst_1 : NonUnitalNonAssocSemiring.{u2} R] [_inst_2 : NonUnitalNonAssocSemiring.{u1} S] [_inst_3 : NonUnitalRingHomClass.{u3, u2, u1} F R S _inst_1 _inst_2] (f : F) (hf : Function.Bijective.{succ u2, succ u1} R S (FunLike.coe.{succ u3, succ u2, succ u1} F R (fun (_x : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2372 : R) => S) _x) (MulHomClass.toFunLike.{u3, u2, u1} F R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (NonUnitalRingHomClass.toMulHomClass.{u3, u2, u1} F R S _inst_1 _inst_2 _inst_3)) f)) (x : R), Eq.{succ u1} ((fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) x) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R (fun (_x : R) => (fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) _x) (EmbeddingLike.toFunLike.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (EquivLike.toEmbeddingLike.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (MulEquivClass.toEquivLike.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (RingEquivClass.toMulEquivClass.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2)) (RingEquiv.instRingEquivClassRingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))))))) (RingEquiv.ofBijective.{u3, u2, u1} F R S _inst_1 _inst_2 _inst_3 f hf) x) (FunLike.coe.{succ u3, succ u2, succ u1} F R (fun (_x : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2372 : R) => S) _x) (MulHomClass.toFunLike.{u3, u2, u1} F R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (NonUnitalRingHomClass.toMulHomClass.{u3, u2, u1} F R S _inst_1 _inst_2 _inst_3)) f x)
+  forall {F : Type.{u3}} {R : Type.{u2}} {S : Type.{u1}} [_inst_1 : NonUnitalNonAssocSemiring.{u2} R] [_inst_2 : NonUnitalNonAssocSemiring.{u1} S] [_inst_3 : NonUnitalRingHomClass.{u3, u2, u1} F R S _inst_1 _inst_2] (f : F) (hf : Function.Bijective.{succ u2, succ u1} R S (FunLike.coe.{succ u3, succ u2, succ u1} F R (fun (_x : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : R) => S) _x) (MulHomClass.toFunLike.{u3, u2, u1} F R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (NonUnitalRingHomClass.toMulHomClass.{u3, u2, u1} F R S _inst_1 _inst_2 _inst_3)) f)) (x : R), Eq.{succ u1} ((fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) x) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R (fun (_x : R) => (fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) _x) (EmbeddingLike.toFunLike.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (EquivLike.toEmbeddingLike.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (MulEquivClass.toEquivLike.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (RingEquivClass.toMulEquivClass.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2)) (RingEquiv.instRingEquivClassRingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))))))) (RingEquiv.ofBijective.{u3, u2, u1} F R S _inst_1 _inst_2 _inst_3 f hf) x) (FunLike.coe.{succ u3, succ u2, succ u1} F R (fun (_x : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : R) => S) _x) (MulHomClass.toFunLike.{u3, u2, u1} F R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (NonUnitalRingHomClass.toMulHomClass.{u3, u2, u1} F R S _inst_1 _inst_2 _inst_3)) f x)
 Case conversion may be inaccurate. Consider using '#align ring_equiv.of_bijective_apply RingEquiv.ofBijective_applyₓ'. -/
 theorem ofBijective_apply [NonUnitalRingHomClass F R S] (f : F) (hf : Function.Bijective f)
     (x : R) : ofBijective f hf x = f x :=
@@ -1062,7 +1062,7 @@ theorem toNonUnitalRingHom_eq_coe (f : R ≃+* S) : f.toNonUnitalRingHom = ↑f
 lean 3 declaration is
   forall {R : Type.{u1}} {S : Type.{u2}} [_inst_1 : NonUnitalNonAssocSemiring.{u1} R] [_inst_2 : NonUnitalNonAssocSemiring.{u2} S] (f : RingEquiv.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2)) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2))), Eq.{max (succ u1) (succ u2)} (R -> S) (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} R S _inst_1 _inst_2) (fun (_x : NonUnitalRingHom.{u1, u2} R S _inst_1 _inst_2) => R -> S) (NonUnitalRingHom.hasCoeToFun.{u1, u2} R S _inst_1 _inst_2) ((fun (a : Sort.{max (succ u1) (succ u2)}) (b : Sort.{max (succ u1) (succ u2)}) [self : HasLiftT.{max (succ u1) (succ u2), max (succ u1) (succ u2)} a b] => self.0) (RingEquiv.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2)) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2))) (NonUnitalRingHom.{u1, u2} R S _inst_1 _inst_2) (HasLiftT.mk.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingEquiv.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2)) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2))) (NonUnitalRingHom.{u1, u2} R S _inst_1 _inst_2) (CoeTCₓ.coe.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingEquiv.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2)) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2))) (NonUnitalRingHom.{u1, u2} R S _inst_1 _inst_2) (NonUnitalRingHom.hasCoeT.{max u1 u2, u1, u2} (RingEquiv.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2)) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2))) R S _inst_1 _inst_2 (RingEquivClass.toNonUnitalRingHomClass.{max u1 u2, u1, u2} (RingEquiv.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2)) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2))) R S _inst_1 _inst_2 (RingEquiv.ringEquivClass.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2)) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2))))))) f)) (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingEquiv.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2)) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2))) (fun (_x : RingEquiv.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2)) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2))) => R -> S) (RingEquiv.hasCoeToFun.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2)) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2))) f)
 but is expected to have type
-  forall {R : Type.{u2}} {S : Type.{u1}} [_inst_1 : NonUnitalNonAssocSemiring.{u2} R] [_inst_2 : NonUnitalNonAssocSemiring.{u1} S] (f : RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))), Eq.{max (succ u2) (succ u1)} (forall (ᾰ : R), (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2372 : R) => S) ᾰ) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R (fun (_x : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2372 : R) => S) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R S _inst_1 _inst_2 (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2))) (NonUnitalRingHomClass.toNonUnitalRingHom.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S _inst_1 _inst_2 (RingEquivClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S _inst_1 _inst_2 (RingEquiv.instRingEquivClassRingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2)))) f)) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R (fun (_x : R) => (fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) _x) (EmbeddingLike.toFunLike.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (EquivLike.toEmbeddingLike.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (MulEquivClass.toEquivLike.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (RingEquivClass.toMulEquivClass.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2)) (RingEquiv.instRingEquivClassRingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))))))) f)
+  forall {R : Type.{u2}} {S : Type.{u1}} [_inst_1 : NonUnitalNonAssocSemiring.{u2} R] [_inst_2 : NonUnitalNonAssocSemiring.{u1} S] (f : RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))), Eq.{max (succ u2) (succ u1)} (forall (ᾰ : R), (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : R) => S) ᾰ) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R (fun (_x : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : R) => S) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R S _inst_1 _inst_2 (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2))) (NonUnitalRingHomClass.toNonUnitalRingHom.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S _inst_1 _inst_2 (RingEquivClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S _inst_1 _inst_2 (RingEquiv.instRingEquivClassRingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2)))) f)) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R (fun (_x : R) => (fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) _x) (EmbeddingLike.toFunLike.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (EquivLike.toEmbeddingLike.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (MulEquivClass.toEquivLike.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (RingEquivClass.toMulEquivClass.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2)) (RingEquiv.instRingEquivClassRingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))))))) f)
 Case conversion may be inaccurate. Consider using '#align ring_equiv.coe_to_non_unital_ring_hom RingEquiv.coe_toNonUnitalRingHomₓ'. -/
 @[simp, norm_cast]
 theorem coe_toNonUnitalRingHom (f : R ≃+* S) : ⇑(f : R →ₙ+* S) = f :=
@@ -1091,7 +1091,7 @@ theorem toNonUnitalRingHom_refl : (RingEquiv.refl R).toNonUnitalRingHom = NonUni
 lean 3 declaration is
   forall {R : Type.{u1}} {S : Type.{u2}} [_inst_1 : NonUnitalNonAssocSemiring.{u1} R] [_inst_2 : NonUnitalNonAssocSemiring.{u2} S] (e : RingEquiv.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2)) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2))) (y : S), Eq.{succ u2} S (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} R S _inst_1 _inst_2) (fun (_x : NonUnitalRingHom.{u1, u2} R S _inst_1 _inst_2) => R -> S) (NonUnitalRingHom.hasCoeToFun.{u1, u2} R S _inst_1 _inst_2) (RingEquiv.toNonUnitalRingHom.{u1, u2} R S _inst_1 _inst_2 e) (coeFn.{max (succ u2) (succ u1), max (succ u2) (succ u1)} (NonUnitalRingHom.{u2, u1} S R _inst_2 _inst_1) (fun (_x : NonUnitalRingHom.{u2, u1} S R _inst_2 _inst_1) => S -> R) (NonUnitalRingHom.hasCoeToFun.{u2, u1} S R _inst_2 _inst_1) (RingEquiv.toNonUnitalRingHom.{u2, u1} S R _inst_2 _inst_1 (RingEquiv.symm.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2)) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2)) e)) y)) y
 but is expected to have type
-  forall {R : Type.{u2}} {S : Type.{u1}} [_inst_1 : NonUnitalNonAssocSemiring.{u2} R] [_inst_2 : NonUnitalNonAssocSemiring.{u1} S] (e : RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) (y : S), Eq.{succ u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2372 : R) => S) (FunLike.coe.{max (succ u2) (succ u1), succ u1, succ u2} (NonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1) S (fun (a : S) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2372 : S) => R) a) (MulHomClass.toFunLike.{max u2 u1, u1, u2} (NonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1) S R (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u1, u2} (NonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1) S R _inst_2 _inst_1 (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1))) (RingEquiv.toNonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1 (RingEquiv.symm.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2)) e)) y)) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R (fun (_x : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2372 : R) => S) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R S _inst_1 _inst_2 (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2))) (RingEquiv.toNonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2 e) (FunLike.coe.{max (succ u2) (succ u1), succ u1, succ u2} (NonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1) S (fun (_x : S) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2372 : S) => R) _x) (MulHomClass.toFunLike.{max u2 u1, u1, u2} (NonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1) S R (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u1, u2} (NonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1) S R _inst_2 _inst_1 (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1))) (RingEquiv.toNonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1 (RingEquiv.symm.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2)) e)) y)) y
+  forall {R : Type.{u2}} {S : Type.{u1}} [_inst_1 : NonUnitalNonAssocSemiring.{u2} R] [_inst_2 : NonUnitalNonAssocSemiring.{u1} S] (e : RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) (y : S), Eq.{succ u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : R) => S) (FunLike.coe.{max (succ u2) (succ u1), succ u1, succ u2} (NonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1) S (fun (a : S) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : S) => R) a) (MulHomClass.toFunLike.{max u2 u1, u1, u2} (NonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1) S R (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u1, u2} (NonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1) S R _inst_2 _inst_1 (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1))) (RingEquiv.toNonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1 (RingEquiv.symm.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2)) e)) y)) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R (fun (_x : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : R) => S) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R S _inst_1 _inst_2 (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2))) (RingEquiv.toNonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2 e) (FunLike.coe.{max (succ u2) (succ u1), succ u1, succ u2} (NonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1) S (fun (_x : S) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : S) => R) _x) (MulHomClass.toFunLike.{max u2 u1, u1, u2} (NonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1) S R (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u1, u2} (NonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1) S R _inst_2 _inst_1 (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1))) (RingEquiv.toNonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1 (RingEquiv.symm.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2)) e)) y)) y
 Case conversion may be inaccurate. Consider using '#align ring_equiv.to_non_unital_ring_hom_apply_symm_to_non_unital_ring_hom_apply RingEquiv.toNonUnitalRingHom_apply_symm_toNonUnitalRingHom_applyₓ'. -/
 @[simp]
 theorem toNonUnitalRingHom_apply_symm_toNonUnitalRingHom_apply (e : R ≃+* S) :
@@ -1103,7 +1103,7 @@ theorem toNonUnitalRingHom_apply_symm_toNonUnitalRingHom_apply (e : R ≃+* S) :
 lean 3 declaration is
   forall {R : Type.{u1}} {S : Type.{u2}} [_inst_1 : NonUnitalNonAssocSemiring.{u1} R] [_inst_2 : NonUnitalNonAssocSemiring.{u2} S] (e : RingEquiv.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2)) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2))) (x : R), Eq.{succ u1} R (coeFn.{max (succ u2) (succ u1), max (succ u2) (succ u1)} (NonUnitalRingHom.{u2, u1} S R _inst_2 _inst_1) (fun (_x : NonUnitalRingHom.{u2, u1} S R _inst_2 _inst_1) => S -> R) (NonUnitalRingHom.hasCoeToFun.{u2, u1} S R _inst_2 _inst_1) (RingEquiv.toNonUnitalRingHom.{u2, u1} S R _inst_2 _inst_1 (RingEquiv.symm.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2)) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2)) e)) (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} R S _inst_1 _inst_2) (fun (_x : NonUnitalRingHom.{u1, u2} R S _inst_1 _inst_2) => R -> S) (NonUnitalRingHom.hasCoeToFun.{u1, u2} R S _inst_1 _inst_2) (RingEquiv.toNonUnitalRingHom.{u1, u2} R S _inst_1 _inst_2 e) x)) x
 but is expected to have type
-  forall {R : Type.{u2}} {S : Type.{u1}} [_inst_1 : NonUnitalNonAssocSemiring.{u2} R] [_inst_2 : NonUnitalNonAssocSemiring.{u1} S] (e : RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) (x : R), Eq.{succ u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2372 : S) => R) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R (fun (a : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2372 : R) => S) a) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R S _inst_1 _inst_2 (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2))) (RingEquiv.toNonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2 e) x)) (FunLike.coe.{max (succ u2) (succ u1), succ u1, succ u2} (NonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1) S (fun (_x : S) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2372 : S) => R) _x) (MulHomClass.toFunLike.{max u2 u1, u1, u2} (NonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1) S R (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u1, u2} (NonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1) S R _inst_2 _inst_1 (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1))) (RingEquiv.toNonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1 (RingEquiv.symm.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2)) e)) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R (fun (_x : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2372 : R) => S) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R S _inst_1 _inst_2 (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2))) (RingEquiv.toNonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2 e) x)) x
+  forall {R : Type.{u2}} {S : Type.{u1}} [_inst_1 : NonUnitalNonAssocSemiring.{u2} R] [_inst_2 : NonUnitalNonAssocSemiring.{u1} S] (e : RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) (x : R), Eq.{succ u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : S) => R) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R (fun (a : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : R) => S) a) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R S _inst_1 _inst_2 (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2))) (RingEquiv.toNonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2 e) x)) (FunLike.coe.{max (succ u2) (succ u1), succ u1, succ u2} (NonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1) S (fun (_x : S) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : S) => R) _x) (MulHomClass.toFunLike.{max u2 u1, u1, u2} (NonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1) S R (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u1, u2} (NonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1) S R _inst_2 _inst_1 (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1))) (RingEquiv.toNonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1 (RingEquiv.symm.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2)) e)) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R (fun (_x : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : R) => S) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R S _inst_1 _inst_2 (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2))) (RingEquiv.toNonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2 e) x)) x
 Case conversion may be inaccurate. Consider using '#align ring_equiv.symm_to_non_unital_ring_hom_apply_to_non_unital_ring_hom_apply RingEquiv.symm_toNonUnitalRingHom_apply_toNonUnitalRingHom_applyₓ'. -/
 @[simp]
 theorem symm_toNonUnitalRingHom_apply_toNonUnitalRingHom_apply (e : R ≃+* S) :
@@ -1202,7 +1202,7 @@ theorem toRingHom_eq_coe (f : R ≃+* S) : f.toRingHom = ↑f :=
 lean 3 declaration is
   forall {R : Type.{u1}} {S : Type.{u2}} [_inst_1 : NonAssocSemiring.{u1} R] [_inst_2 : NonAssocSemiring.{u2} S] (f : RingEquiv.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2))) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2)))), Eq.{max (succ u1) (succ u2)} (R -> S) (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingHom.{u1, u2} R S _inst_1 _inst_2) (fun (_x : RingHom.{u1, u2} R S _inst_1 _inst_2) => R -> S) (RingHom.hasCoeToFun.{u1, u2} R S _inst_1 _inst_2) ((fun (a : Sort.{max (succ u1) (succ u2)}) (b : Sort.{max (succ u1) (succ 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(NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2))) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2)))) (RingHom.{u1, u2} R S _inst_1 _inst_2) (CoeTCₓ.coe.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingEquiv.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2))) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2)))) (RingHom.{u1, u2} R S _inst_1 _inst_2) (RingHom.hasCoeT.{max u1 u2, u1, u2} (RingEquiv.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2))) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2)))) R S _inst_1 _inst_2 (RingEquivClass.toRingHomClass.{max u1 u2, u1, u2} (RingEquiv.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2))) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2)))) R S _inst_1 _inst_2 (RingEquiv.ringEquivClass.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2))) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2)))))))) f)) (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingEquiv.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2))) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2)))) (fun (_x : RingEquiv.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2))) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2)))) => R -> S) (RingEquiv.hasCoeToFun.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2))) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2)))) f)
 but is expected to have type
-  forall {R : Type.{u2}} {S : Type.{u1}} [_inst_1 : NonAssocSemiring.{u2} R] [_inst_2 : NonAssocSemiring.{u1} S] (f : RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)))), Eq.{max (succ u2) (succ u1)} (forall (ᾰ : R), (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2372 : R) => S) ᾰ) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R (fun (_x : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2372 : R) => S) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R S _inst_1 _inst_2 (RingHom.instRingHomClassRingHom.{u2, u1} R S _inst_1 _inst_2)))) (RingHomClass.toRingHom.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)))) R S _inst_1 _inst_2 (RingEquivClass.toRingHomClass.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)))) R S _inst_1 _inst_2 (RingEquiv.instRingEquivClassRingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2))))) f)) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)))) R (fun (_x : R) => (fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) _x) (EmbeddingLike.toFunLike.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)))) R S (EquivLike.toEmbeddingLike.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)))) R S (MulEquivClass.toEquivLike.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)))) R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (RingEquivClass.toMulEquivClass.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)))) R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2))) (RingEquiv.instRingEquivClassRingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)))))))) f)
+  forall {R : Type.{u2}} {S : Type.{u1}} [_inst_1 : NonAssocSemiring.{u2} R] [_inst_2 : NonAssocSemiring.{u1} S] (f : RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)))), Eq.{max (succ u2) (succ u1)} (forall (ᾰ : R), (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : R) => S) ᾰ) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R (fun (_x : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : R) => S) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R S _inst_1 _inst_2 (RingHom.instRingHomClassRingHom.{u2, u1} R S _inst_1 _inst_2)))) (RingHomClass.toRingHom.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)))) R S _inst_1 _inst_2 (RingEquivClass.toRingHomClass.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)))) R S _inst_1 _inst_2 (RingEquiv.instRingEquivClassRingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2))))) f)) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)))) R (fun (_x : R) => (fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) _x) (EmbeddingLike.toFunLike.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)))) R S (EquivLike.toEmbeddingLike.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)))) R S (MulEquivClass.toEquivLike.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)))) R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (RingEquivClass.toMulEquivClass.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)))) R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2))) (RingEquiv.instRingEquivClassRingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)))))))) f)
 Case conversion may be inaccurate. Consider using '#align ring_equiv.coe_to_ring_hom RingEquiv.coe_toRingHomₓ'. -/
 @[simp, norm_cast]
 theorem coe_toRingHom (f : R ≃+* S) : ⇑(f : R →+* S) = f :=
@@ -1313,7 +1313,7 @@ theorem toAddMonoidHom_refl : (RingEquiv.refl R).toAddMonoidHom = AddMonoidHom.i
 lean 3 declaration is
   forall {R : Type.{u1}} {S : Type.{u2}} [_inst_1 : NonAssocSemiring.{u1} R] [_inst_2 : NonAssocSemiring.{u2} S] (e : RingEquiv.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2))) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2)))) (y : S), Eq.{succ u2} S (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingHom.{u1, u2} R S _inst_1 _inst_2) (fun (_x : RingHom.{u1, u2} R S _inst_1 _inst_2) => R -> S) (RingHom.hasCoeToFun.{u1, u2} R S _inst_1 _inst_2) (RingEquiv.toRingHom.{u1, u2} R S _inst_1 _inst_2 e) (coeFn.{max (succ u2) (succ u1), max (succ u2) (succ u1)} (RingHom.{u2, u1} S R _inst_2 _inst_1) (fun (_x : RingHom.{u2, u1} S R _inst_2 _inst_1) => S -> R) (RingHom.hasCoeToFun.{u2, u1} S R _inst_2 _inst_1) (RingEquiv.toRingHom.{u2, u1} S R _inst_2 _inst_1 (RingEquiv.symm.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2))) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2))) e)) y)) y
 but is expected to have type
-  forall {R : Type.{u2}} {S : Type.{u1}} [_inst_1 : NonAssocSemiring.{u2} R] [_inst_2 : NonAssocSemiring.{u1} S] (e : RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)))) (y : S), Eq.{succ u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2372 : R) => S) (FunLike.coe.{max (succ u2) (succ u1), succ u1, succ u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S (fun (a : S) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2372 : S) => R) a) (MulHomClass.toFunLike.{max u2 u1, u1, u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S R (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u1, u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u1, u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S R _inst_2 _inst_1 (RingHom.instRingHomClassRingHom.{u1, u2} S R _inst_2 _inst_1)))) (RingEquiv.toRingHom.{u1, u2} S R _inst_2 _inst_1 (RingEquiv.symm.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2))) e)) y)) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R (fun (_x : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2372 : R) => S) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R S _inst_1 _inst_2 (RingHom.instRingHomClassRingHom.{u2, u1} R S _inst_1 _inst_2)))) (RingEquiv.toRingHom.{u2, u1} R S _inst_1 _inst_2 e) (FunLike.coe.{max (succ u2) (succ u1), succ u1, succ u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S (fun (_x : S) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2372 : S) => R) _x) (MulHomClass.toFunLike.{max u2 u1, u1, u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S R (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u1, u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u1, u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S R _inst_2 _inst_1 (RingHom.instRingHomClassRingHom.{u1, u2} S R _inst_2 _inst_1)))) (RingEquiv.toRingHom.{u1, u2} S R _inst_2 _inst_1 (RingEquiv.symm.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2))) e)) y)) y
+  forall {R : Type.{u2}} {S : Type.{u1}} [_inst_1 : NonAssocSemiring.{u2} R] [_inst_2 : NonAssocSemiring.{u1} S] (e : RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)))) (y : S), Eq.{succ u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : R) => S) (FunLike.coe.{max (succ u2) (succ u1), succ u1, succ u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S (fun (a : S) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : S) => R) a) (MulHomClass.toFunLike.{max u2 u1, u1, u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S R (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u1, u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u1, u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S R _inst_2 _inst_1 (RingHom.instRingHomClassRingHom.{u1, u2} S R _inst_2 _inst_1)))) (RingEquiv.toRingHom.{u1, u2} S R _inst_2 _inst_1 (RingEquiv.symm.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2))) e)) y)) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R (fun (_x : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : R) => S) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R S _inst_1 _inst_2 (RingHom.instRingHomClassRingHom.{u2, u1} R S _inst_1 _inst_2)))) (RingEquiv.toRingHom.{u2, u1} R S _inst_1 _inst_2 e) (FunLike.coe.{max (succ u2) (succ u1), succ u1, succ u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S (fun (_x : S) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : S) => R) _x) (MulHomClass.toFunLike.{max u2 u1, u1, u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S R (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u1, u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u1, u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S R _inst_2 _inst_1 (RingHom.instRingHomClassRingHom.{u1, u2} S R _inst_2 _inst_1)))) (RingEquiv.toRingHom.{u1, u2} S R _inst_2 _inst_1 (RingEquiv.symm.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2))) e)) y)) y
 Case conversion may be inaccurate. Consider using '#align ring_equiv.to_ring_hom_apply_symm_to_ring_hom_apply RingEquiv.toRingHom_apply_symm_toRingHom_applyₓ'. -/
 @[simp]
 theorem toRingHom_apply_symm_toRingHom_apply (e : R ≃+* S) :
@@ -1325,7 +1325,7 @@ theorem toRingHom_apply_symm_toRingHom_apply (e : R ≃+* S) :
 lean 3 declaration is
   forall {R : Type.{u1}} {S : Type.{u2}} [_inst_1 : NonAssocSemiring.{u1} R] [_inst_2 : NonAssocSemiring.{u2} S] (e : RingEquiv.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2))) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2)))) (x : R), Eq.{succ u1} R (coeFn.{max (succ u2) (succ u1), max (succ u2) (succ u1)} (RingHom.{u2, u1} S R _inst_2 _inst_1) (fun (_x : RingHom.{u2, u1} S R _inst_2 _inst_1) => S -> R) (RingHom.hasCoeToFun.{u2, u1} S R _inst_2 _inst_1) (RingEquiv.toRingHom.{u2, u1} S R _inst_2 _inst_1 (RingEquiv.symm.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2))) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2))) e)) (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingHom.{u1, u2} R S _inst_1 _inst_2) (fun (_x : RingHom.{u1, u2} R S _inst_1 _inst_2) => R -> S) (RingHom.hasCoeToFun.{u1, u2} R S _inst_1 _inst_2) (RingEquiv.toRingHom.{u1, u2} R S _inst_1 _inst_2 e) x)) x
 but is expected to have type
-  forall {R : Type.{u2}} {S : Type.{u1}} [_inst_1 : NonAssocSemiring.{u2} R] [_inst_2 : NonAssocSemiring.{u1} S] (e : RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)))) (x : R), Eq.{succ u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2372 : S) => R) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R (fun (a : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2372 : R) => S) a) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R S _inst_1 _inst_2 (RingHom.instRingHomClassRingHom.{u2, u1} R S _inst_1 _inst_2)))) (RingEquiv.toRingHom.{u2, u1} R S _inst_1 _inst_2 e) x)) (FunLike.coe.{max (succ u2) (succ u1), succ u1, succ u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S (fun (_x : S) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2372 : S) => R) _x) (MulHomClass.toFunLike.{max u2 u1, u1, u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S R (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u1, u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u1, u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S R _inst_2 _inst_1 (RingHom.instRingHomClassRingHom.{u1, u2} S R _inst_2 _inst_1)))) (RingEquiv.toRingHom.{u1, u2} S R _inst_2 _inst_1 (RingEquiv.symm.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2))) e)) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R (fun (_x : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2372 : R) => S) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R S _inst_1 _inst_2 (RingHom.instRingHomClassRingHom.{u2, u1} R S _inst_1 _inst_2)))) (RingEquiv.toRingHom.{u2, u1} R S _inst_1 _inst_2 e) x)) x
+  forall {R : Type.{u2}} {S : Type.{u1}} [_inst_1 : NonAssocSemiring.{u2} R] [_inst_2 : NonAssocSemiring.{u1} S] (e : RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)))) (x : R), Eq.{succ u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : S) => R) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R (fun (a : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : R) => S) a) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R S _inst_1 _inst_2 (RingHom.instRingHomClassRingHom.{u2, u1} R S _inst_1 _inst_2)))) (RingEquiv.toRingHom.{u2, u1} R S _inst_1 _inst_2 e) x)) (FunLike.coe.{max (succ u2) (succ u1), succ u1, succ u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S (fun (_x : S) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : S) => R) _x) (MulHomClass.toFunLike.{max u2 u1, u1, u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S R (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u1, u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u1, u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S R _inst_2 _inst_1 (RingHom.instRingHomClassRingHom.{u1, u2} S R _inst_2 _inst_1)))) (RingEquiv.toRingHom.{u1, u2} S R _inst_2 _inst_1 (RingEquiv.symm.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2))) e)) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R (fun (_x : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2391 : R) => S) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R S _inst_1 _inst_2 (RingHom.instRingHomClassRingHom.{u2, u1} R S _inst_1 _inst_2)))) (RingEquiv.toRingHom.{u2, u1} R S _inst_1 _inst_2 e) x)) x
 Case conversion may be inaccurate. Consider using '#align ring_equiv.symm_to_ring_hom_apply_to_ring_hom_apply RingEquiv.symm_toRingHom_apply_toRingHom_applyₓ'. -/
 @[simp]
 theorem symm_toRingHom_apply_toRingHom_apply (e : R ≃+* S) :

mathlib commit https://github.com/leanprover-community/mathlib/commit/21e3562c5e12d846c7def5eff8cdbc520d7d4936

@@ -468,7 +468,7 @@ theorem mk_coe' (e : R ≃+* S) (f h₁ h₂ h₃ h₄) :
 lean 3 declaration is
   forall {R : Type.{u1}} {S : Type.{u2}} [_inst_1 : Mul.{u1} R] [_inst_2 : Add.{u1} R] [_inst_3 : Mul.{u2} S] [_inst_4 : Add.{u2} S] (f : R -> S) (g : S -> R) (h₁ : Function.LeftInverse.{succ u1, succ u2} R S g f) (h₂ : Function.RightInverse.{succ u1, succ u2} R S g f) (h₃ : forall (x : R) (y : R), Eq.{succ u2} S (f (HMul.hMul.{u1, u1, u1} R R R (instHMul.{u1} R _inst_1) x y)) (HMul.hMul.{u2, u2, u2} S S S (instHMul.{u2} S _inst_3) (f x) (f y))) (h₄ : forall (x : R) (y : R), Eq.{succ u2} S (f (HAdd.hAdd.{u1, u1, u1} R R R (instHAdd.{u1} R _inst_2) x y)) (HAdd.hAdd.{u2, u2, u2} S S S (instHAdd.{u2} S _inst_4) (f x) (f y))), Eq.{max (succ u2) (succ u1)} (RingEquiv.{u2, u1} S R _inst_3 _inst_4 _inst_1 _inst_2) (RingEquiv.symm.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4 (RingEquiv.mk.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4 f g h₁ h₂ h₃ h₄)) (RingEquiv.mk.{u2, u1} S R _inst_3 _inst_4 _inst_1 _inst_2 g f (RingEquiv.left_inv.{u2, u1} S R _inst_3 _inst_4 _inst_1 _inst_2 (RingEquiv.symm.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4 (RingEquiv.mk.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4 f g h₁ h₂ h₃ h₄))) (RingEquiv.right_inv.{u2, u1} S R _inst_3 _inst_4 _inst_1 _inst_2 (RingEquiv.symm.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4 (RingEquiv.mk.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4 f g h₁ h₂ h₃ h₄))) (RingEquiv.map_mul'.{u2, u1} S R _inst_3 _inst_4 _inst_1 _inst_2 (RingEquiv.symm.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4 (RingEquiv.mk.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4 f g h₁ h₂ h₃ h₄))) (RingEquiv.map_add'.{u2, u1} S R _inst_3 _inst_4 _inst_1 _inst_2 (RingEquiv.symm.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4 (RingEquiv.mk.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4 f g h₁ h₂ h₃ h₄))))
 but is expected to have type
-  forall {R : Type.{u2}} {S : Type.{u1}} [_inst_1 : Mul.{u2} R] [_inst_2 : Mul.{u1} S] [_inst_3 : Add.{u2} R] [_inst_4 : Add.{u1} S] (f : R -> S) (g : S -> R) (h₁ : Function.LeftInverse.{succ u2, succ u1} R S g f) (h₂ : Function.RightInverse.{succ u2, succ u1} R S g f) (h₃ : forall (x : R) (y : R), Eq.{succ u1} S (Equiv.toFun.{succ u2, succ u1} R S (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) (HMul.hMul.{u2, u2, u2} R R R (instHMul.{u2} R _inst_1) x y)) (HMul.hMul.{u1, u1, u1} S S S (instHMul.{u1} S _inst_2) (Equiv.toFun.{succ u2, succ u1} R S (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) x) (Equiv.toFun.{succ u2, succ u1} R S (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) y))) (h₄ : forall (x : R) (y : R), Eq.{succ u1} S (Equiv.toFun.{succ u2, succ u1} R S (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) (HAdd.hAdd.{u2, u2, u2} R R R (instHAdd.{u2} R _inst_3) x y)) (HAdd.hAdd.{u1, u1, u1} S S S (instHAdd.{u1} S _inst_4) (Equiv.toFun.{succ u2, succ u1} R S (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) x) (Equiv.toFun.{succ u2, succ u1} R S (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) y))), Eq.{max (succ u2) (succ u1)} (RingEquiv.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3) (RingEquiv.symm.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4 (RingEquiv.mk.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4 (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) h₃ h₄)) (let src._@.Mathlib.Algebra.Ring.Equiv._hyg.2434 : RingEquiv.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3 := RingEquiv.symm.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4 (RingEquiv.mk.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4 (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) h₃ h₄); RingEquiv.mk.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3 (Equiv.mk.{succ u1, succ u2} S R g f (Equiv.left_inv.{succ u1, succ u2} S R (RingEquiv.toEquiv.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3 src._@.Mathlib.Algebra.Ring.Equiv._hyg.2434)) (Equiv.right_inv.{succ u1, succ u2} S R (RingEquiv.toEquiv.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3 src._@.Mathlib.Algebra.Ring.Equiv._hyg.2434))) (RingEquiv.map_mul'.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3 src._@.Mathlib.Algebra.Ring.Equiv._hyg.2434) (RingEquiv.map_add'.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3 src._@.Mathlib.Algebra.Ring.Equiv._hyg.2434))
+  forall {R : Type.{u2}} {S : Type.{u1}} [_inst_1 : Mul.{u2} R] [_inst_2 : Mul.{u1} S] [_inst_3 : Add.{u2} R] [_inst_4 : Add.{u1} S] (f : R -> S) (g : S -> R) (h₁ : Function.LeftInverse.{succ u2, succ u1} R S g f) (h₂ : Function.RightInverse.{succ u2, succ u1} R S g f) (h₃ : forall (x : R) (y : R), Eq.{succ u1} S (Equiv.toFun.{succ u2, succ u1} R S (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) (HMul.hMul.{u2, u2, u2} R R R (instHMul.{u2} R _inst_1) x y)) (HMul.hMul.{u1, u1, u1} S S S (instHMul.{u1} S _inst_2) (Equiv.toFun.{succ u2, succ u1} R S (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) x) (Equiv.toFun.{succ u2, succ u1} R S (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) y))) (h₄ : forall (x : R) (y : R), Eq.{succ u1} S (Equiv.toFun.{succ u2, succ u1} R S (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) (HAdd.hAdd.{u2, u2, u2} R R R (instHAdd.{u2} R _inst_3) x y)) (HAdd.hAdd.{u1, u1, u1} S S S (instHAdd.{u1} S _inst_4) (Equiv.toFun.{succ u2, succ u1} R S (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) x) (Equiv.toFun.{succ u2, succ u1} R S (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) y))), Eq.{max (succ u2) (succ u1)} (RingEquiv.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3) (RingEquiv.symm.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4 (RingEquiv.mk.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4 (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) h₃ h₄)) (let src._@.Mathlib.Algebra.Ring.Equiv._hyg.2470 : RingEquiv.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3 := RingEquiv.symm.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4 (RingEquiv.mk.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4 (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) h₃ h₄); RingEquiv.mk.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3 (Equiv.mk.{succ u1, succ u2} S R g f (Equiv.left_inv.{succ u1, succ u2} S R (RingEquiv.toEquiv.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3 src._@.Mathlib.Algebra.Ring.Equiv._hyg.2470)) (Equiv.right_inv.{succ u1, succ u2} S R (RingEquiv.toEquiv.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3 src._@.Mathlib.Algebra.Ring.Equiv._hyg.2470))) (RingEquiv.map_mul'.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3 src._@.Mathlib.Algebra.Ring.Equiv._hyg.2470) (RingEquiv.map_add'.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3 src._@.Mathlib.Algebra.Ring.Equiv._hyg.2470))
 Case conversion may be inaccurate. Consider using '#align ring_equiv.symm_mk RingEquiv.symm_mkₓ'. -/
 @[simp]
 theorem symm_mk (f : R → S) (g h₁ h₂ h₃ h₄) :
@@ -896,7 +896,7 @@ in higher generality -/
 lean 3 declaration is
   forall {R : Type.{u1}} [_inst_1 : NonAssocSemiring.{u1} R], Eq.{succ u1} (MonoidHom.{u1, u1} R R (MulZeroOneClass.toMulOneClass.{u1} R (NonAssocSemiring.toMulZeroOneClass.{u1} R _inst_1)) (MulZeroOneClass.toMulOneClass.{u1} R (NonAssocSemiring.toMulZeroOneClass.{u1} R _inst_1))) ((fun (a : Type.{u1}) (b : Type.{u1}) [self : HasLiftT.{succ u1, succ u1} a b] => self.0) (RingEquiv.{u1, u1} R R (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1)))) (MonoidHom.{u1, u1} R R (MulZeroOneClass.toMulOneClass.{u1} R (NonAssocSemiring.toMulZeroOneClass.{u1} R _inst_1)) (MulZeroOneClass.toMulOneClass.{u1} R (NonAssocSemiring.toMulZeroOneClass.{u1} R _inst_1))) (HasLiftT.mk.{succ u1, succ u1} (RingEquiv.{u1, u1} R R (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1)))) (MonoidHom.{u1, u1} R R (MulZeroOneClass.toMulOneClass.{u1} R (NonAssocSemiring.toMulZeroOneClass.{u1} R _inst_1)) (MulZeroOneClass.toMulOneClass.{u1} R (NonAssocSemiring.toMulZeroOneClass.{u1} R _inst_1))) (CoeTCₓ.coe.{succ u1, succ u1} (RingEquiv.{u1, u1} R R (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1)))) (MonoidHom.{u1, u1} R R (MulZeroOneClass.toMulOneClass.{u1} R (NonAssocSemiring.toMulZeroOneClass.{u1} R _inst_1)) (MulZeroOneClass.toMulOneClass.{u1} R (NonAssocSemiring.toMulZeroOneClass.{u1} R _inst_1))) (MonoidHom.hasCoeT.{u1, u1, u1} R R (RingEquiv.{u1, u1} R R (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1)))) (MulZeroOneClass.toMulOneClass.{u1} R (NonAssocSemiring.toMulZeroOneClass.{u1} R _inst_1)) (MulZeroOneClass.toMulOneClass.{u1} R (NonAssocSemiring.toMulZeroOneClass.{u1} R _inst_1)) (RingHomClass.toMonoidHomClass.{u1, u1, u1} (RingEquiv.{u1, u1} R R (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1)))) R R _inst_1 _inst_1 (RingEquivClass.toRingHomClass.{u1, u1, u1} (RingEquiv.{u1, u1} R R (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1)))) R R _inst_1 _inst_1 (RingEquiv.ringEquivClass.{u1, u1} R R (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))))))))) (RingEquiv.refl.{u1} R (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))))) ((fun (a : Type.{u1}) (b : Type.{u1}) [self : HasLiftT.{succ u1, succ u1} a b] => self.0) (RingHom.{u1, u1} R R _inst_1 _inst_1) (MonoidHom.{u1, u1} R R (MulZeroOneClass.toMulOneClass.{u1} R (NonAssocSemiring.toMulZeroOneClass.{u1} R _inst_1)) (MulZeroOneClass.toMulOneClass.{u1} R (NonAssocSemiring.toMulZeroOneClass.{u1} R _inst_1))) (HasLiftT.mk.{succ u1, succ u1} (RingHom.{u1, u1} R R _inst_1 _inst_1) (MonoidHom.{u1, u1} R R (MulZeroOneClass.toMulOneClass.{u1} R (NonAssocSemiring.toMulZeroOneClass.{u1} R _inst_1)) (MulZeroOneClass.toMulOneClass.{u1} R (NonAssocSemiring.toMulZeroOneClass.{u1} R _inst_1))) (CoeTCₓ.coe.{succ u1, succ u1} (RingHom.{u1, u1} R R _inst_1 _inst_1) (MonoidHom.{u1, u1} R R (MulZeroOneClass.toMulOneClass.{u1} R (NonAssocSemiring.toMulZeroOneClass.{u1} R _inst_1)) (MulZeroOneClass.toMulOneClass.{u1} R (NonAssocSemiring.toMulZeroOneClass.{u1} R _inst_1))) (MonoidHom.hasCoeT.{u1, u1, u1} R R (RingHom.{u1, u1} R R _inst_1 _inst_1) (MulZeroOneClass.toMulOneClass.{u1} R (NonAssocSemiring.toMulZeroOneClass.{u1} R _inst_1)) (MulZeroOneClass.toMulOneClass.{u1} R (NonAssocSemiring.toMulZeroOneClass.{u1} R _inst_1)) (RingHomClass.toMonoidHomClass.{u1, u1, u1} (RingHom.{u1, u1} R R _inst_1 _inst_1) R R _inst_1 _inst_1 (RingHom.ringHomClass.{u1, u1} R R _inst_1 _inst_1))))) (RingHom.id.{u1} R _inst_1))
 but is expected to have type
-  forall {R : Type.{u1}} [_inst_1 : NonAssocSemiring.{u1} R], Eq.{succ u1} (MonoidHom.{u1, u1} R R (MulZeroOneClass.toMulOneClass.{u1} R (NonAssocSemiring.toMulZeroOneClass.{u1} R _inst_1)) (MulZeroOneClass.toMulOneClass.{u1} R (NonAssocSemiring.toMulZeroOneClass.{u1} R _inst_1))) (MonoidHomClass.toMonoidHom.{u1, u1, u1} R R (RingEquiv.{u1, u1} R R (NonUnitalNonAssocSemiring.toMul.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1)) (Distrib.toAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1)))) (MulZeroOneClass.toMulOneClass.{u1} R (NonAssocSemiring.toMulZeroOneClass.{u1} R _inst_1)) (MulZeroOneClass.toMulOneClass.{u1} R (NonAssocSemiring.toMulZeroOneClass.{u1} R _inst_1)) (RingHomClass.toMonoidHomClass.{u1, u1, u1} (RingEquiv.{u1, u1} R R (NonUnitalNonAssocSemiring.toMul.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1)) (Distrib.toAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1)))) R R _inst_1 _inst_1 (RingEquivClass.toRingHomClass.{u1, u1, u1} (RingEquiv.{u1, u1} R R (NonUnitalNonAssocSemiring.toMul.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1)) (Distrib.toAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1)))) R R _inst_1 _inst_1 (RingEquiv.instRingEquivClassRingEquiv.{u1, u1} R R (NonUnitalNonAssocSemiring.toMul.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1)) (Distrib.toAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1)))))) (RingEquiv.refl.{u1} R (NonUnitalNonAssocSemiring.toMul.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1)) (Distrib.toAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))))) (MonoidHomClass.toMonoidHom.{u1, u1, u1} R R (RingHom.{u1, u1} R R _inst_1 _inst_1) (MulZeroOneClass.toMulOneClass.{u1} R (NonAssocSemiring.toMulZeroOneClass.{u1} R _inst_1)) (MulZeroOneClass.toMulOneClass.{u1} R (NonAssocSemiring.toMulZeroOneClass.{u1} R _inst_1)) (RingHomClass.toMonoidHomClass.{u1, u1, u1} (RingHom.{u1, u1} R R _inst_1 _inst_1) R R _inst_1 _inst_1 (RingHom.instRingHomClassRingHom.{u1, u1} R R _inst_1 _inst_1)) (RingHom.id.{u1} R _inst_1))
+  forall {R : Type.{u1}} [_inst_1 : NonAssocSemiring.{u1} R], Eq.{succ u1} (RingHom.{u1, u1} R R _inst_1 _inst_1) (RingHomClass.toRingHom.{u1, u1, u1} (RingEquiv.{u1, u1} R R (NonUnitalNonAssocSemiring.toMul.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1)) (Distrib.toAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1)))) R R _inst_1 _inst_1 (RingEquivClass.toRingHomClass.{u1, u1, u1} (RingEquiv.{u1, u1} R R (NonUnitalNonAssocSemiring.toMul.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1)) (Distrib.toAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1)))) R R _inst_1 _inst_1 (RingEquiv.instRingEquivClassRingEquiv.{u1, u1} R R (NonUnitalNonAssocSemiring.toMul.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1)) (Distrib.toAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))))) (RingEquiv.refl.{u1} R (NonUnitalNonAssocSemiring.toMul.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1)) (Distrib.toAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))))) (RingHom.id.{u1} R _inst_1)
 Case conversion may be inaccurate. Consider using '#align ring_equiv.coe_ring_hom_refl RingEquiv.coe_ringHom_reflₓ'. -/
 @[simp]
 theorem coe_ringHom_refl : (RingEquiv.refl R : R →* R) = RingHom.id R :=

mathlib commit https://github.com/leanprover-community/mathlib/commit/38f16f960f5006c6c0c2bac7b0aba5273188f4e5

@@ -468,7 +468,7 @@ theorem mk_coe' (e : R ≃+* S) (f h₁ h₂ h₃ h₄) :
 lean 3 declaration is
   forall {R : Type.{u1}} {S : Type.{u2}} [_inst_1 : Mul.{u1} R] [_inst_2 : Add.{u1} R] [_inst_3 : Mul.{u2} S] [_inst_4 : Add.{u2} S] (f : R -> S) (g : S -> R) (h₁ : Function.LeftInverse.{succ u1, succ u2} R S g f) (h₂ : Function.RightInverse.{succ u1, succ u2} R S g f) (h₃ : forall (x : R) (y : R), Eq.{succ u2} S (f (HMul.hMul.{u1, u1, u1} R R R (instHMul.{u1} R _inst_1) x y)) (HMul.hMul.{u2, u2, u2} S S S (instHMul.{u2} S _inst_3) (f x) (f y))) (h₄ : forall (x : R) (y : R), Eq.{succ u2} S (f (HAdd.hAdd.{u1, u1, u1} R R R (instHAdd.{u1} R _inst_2) x y)) (HAdd.hAdd.{u2, u2, u2} S S S (instHAdd.{u2} S _inst_4) (f x) (f y))), Eq.{max (succ u2) (succ u1)} (RingEquiv.{u2, u1} S R _inst_3 _inst_4 _inst_1 _inst_2) (RingEquiv.symm.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4 (RingEquiv.mk.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4 f g h₁ h₂ h₃ h₄)) (RingEquiv.mk.{u2, u1} S R _inst_3 _inst_4 _inst_1 _inst_2 g f (RingEquiv.left_inv.{u2, u1} S R _inst_3 _inst_4 _inst_1 _inst_2 (RingEquiv.symm.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4 (RingEquiv.mk.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4 f g h₁ h₂ h₃ h₄))) (RingEquiv.right_inv.{u2, u1} S R _inst_3 _inst_4 _inst_1 _inst_2 (RingEquiv.symm.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4 (RingEquiv.mk.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4 f g h₁ h₂ h₃ h₄))) (RingEquiv.map_mul'.{u2, u1} S R _inst_3 _inst_4 _inst_1 _inst_2 (RingEquiv.symm.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4 (RingEquiv.mk.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4 f g h₁ h₂ h₃ h₄))) (RingEquiv.map_add'.{u2, u1} S R _inst_3 _inst_4 _inst_1 _inst_2 (RingEquiv.symm.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4 (RingEquiv.mk.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4 f g h₁ h₂ h₃ h₄))))
 but is expected to have type
-  forall {R : Type.{u2}} {S : Type.{u1}} [_inst_1 : Mul.{u2} R] [_inst_2 : Mul.{u1} S] [_inst_3 : Add.{u2} R] [_inst_4 : Add.{u1} S] (f : R -> S) (g : S -> R) (h₁ : Function.LeftInverse.{succ u2, succ u1} R S g f) (h₂ : Function.RightInverse.{succ u2, succ u1} R S g f) (h₃ : forall (x : R) (y : R), Eq.{succ u1} S (Equiv.toFun.{succ u2, succ u1} R S (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) (HMul.hMul.{u2, u2, u2} R R R (instHMul.{u2} R _inst_1) x y)) (HMul.hMul.{u1, u1, u1} S S S (instHMul.{u1} S _inst_2) (Equiv.toFun.{succ u2, succ u1} R S (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) x) (Equiv.toFun.{succ u2, succ u1} R S (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) y))) (h₄ : forall (x : R) (y : R), Eq.{succ u1} S (Equiv.toFun.{succ u2, succ u1} R S (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) (HAdd.hAdd.{u2, u2, u2} R R R (instHAdd.{u2} R _inst_3) x y)) (HAdd.hAdd.{u1, u1, u1} S S S (instHAdd.{u1} S _inst_4) (Equiv.toFun.{succ u2, succ u1} R S (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) x) (Equiv.toFun.{succ u2, succ u1} R S (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) y))), Eq.{max (succ u2) (succ u1)} (RingEquiv.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3) (RingEquiv.symm.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4 (RingEquiv.mk.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4 (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) h₃ h₄)) (let src._@.Mathlib.Algebra.Ring.Equiv._hyg.2472 : RingEquiv.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3 := RingEquiv.symm.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4 (RingEquiv.mk.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4 (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) h₃ h₄); RingEquiv.mk.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3 (Equiv.mk.{succ u1, succ u2} S R g f (Equiv.left_inv.{succ u1, succ u2} S R (RingEquiv.toEquiv.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3 src._@.Mathlib.Algebra.Ring.Equiv._hyg.2472)) (Equiv.right_inv.{succ u1, succ u2} S R (RingEquiv.toEquiv.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3 src._@.Mathlib.Algebra.Ring.Equiv._hyg.2472))) (RingEquiv.map_mul'.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3 src._@.Mathlib.Algebra.Ring.Equiv._hyg.2472) (RingEquiv.map_add'.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3 src._@.Mathlib.Algebra.Ring.Equiv._hyg.2472))
+  forall {R : Type.{u2}} {S : Type.{u1}} [_inst_1 : Mul.{u2} R] [_inst_2 : Mul.{u1} S] [_inst_3 : Add.{u2} R] [_inst_4 : Add.{u1} S] (f : R -> S) (g : S -> R) (h₁ : Function.LeftInverse.{succ u2, succ u1} R S g f) (h₂ : Function.RightInverse.{succ u2, succ u1} R S g f) (h₃ : forall (x : R) (y : R), Eq.{succ u1} S (Equiv.toFun.{succ u2, succ u1} R S (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) (HMul.hMul.{u2, u2, u2} R R R (instHMul.{u2} R _inst_1) x y)) (HMul.hMul.{u1, u1, u1} S S S (instHMul.{u1} S _inst_2) (Equiv.toFun.{succ u2, succ u1} R S (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) x) (Equiv.toFun.{succ u2, succ u1} R S (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) y))) (h₄ : forall (x : R) (y : R), Eq.{succ u1} S (Equiv.toFun.{succ u2, succ u1} R S (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) (HAdd.hAdd.{u2, u2, u2} R R R (instHAdd.{u2} R _inst_3) x y)) (HAdd.hAdd.{u1, u1, u1} S S S (instHAdd.{u1} S _inst_4) (Equiv.toFun.{succ u2, succ u1} R S (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) x) (Equiv.toFun.{succ u2, succ u1} R S (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) y))), Eq.{max (succ u2) (succ u1)} (RingEquiv.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3) (RingEquiv.symm.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4 (RingEquiv.mk.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4 (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) h₃ h₄)) (let src._@.Mathlib.Algebra.Ring.Equiv._hyg.2434 : RingEquiv.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3 := RingEquiv.symm.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4 (RingEquiv.mk.{u2, u1} R S _inst_1 _inst_2 _inst_3 _inst_4 (Equiv.mk.{succ u2, succ u1} R S f g h₁ h₂) h₃ h₄); RingEquiv.mk.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3 (Equiv.mk.{succ u1, succ u2} S R g f (Equiv.left_inv.{succ u1, succ u2} S R (RingEquiv.toEquiv.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3 src._@.Mathlib.Algebra.Ring.Equiv._hyg.2434)) (Equiv.right_inv.{succ u1, succ u2} S R (RingEquiv.toEquiv.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3 src._@.Mathlib.Algebra.Ring.Equiv._hyg.2434))) (RingEquiv.map_mul'.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3 src._@.Mathlib.Algebra.Ring.Equiv._hyg.2434) (RingEquiv.map_add'.{u1, u2} S R _inst_2 _inst_1 _inst_4 _inst_3 src._@.Mathlib.Algebra.Ring.Equiv._hyg.2434))
 Case conversion may be inaccurate. Consider using '#align ring_equiv.symm_mk RingEquiv.symm_mkₓ'. -/
 @[simp]
 theorem symm_mk (f : R → S) (g h₁ h₂ h₃ h₄) :
@@ -734,7 +734,7 @@ theorem map_ne_zero_iff : f x ≠ 0 ↔ x ≠ 0 :=
 lean 3 declaration is
   forall {F : Type.{u1}} {R : Type.{u2}} {S : Type.{u3}} [_inst_1 : NonUnitalNonAssocSemiring.{u2} R] [_inst_2 : NonUnitalNonAssocSemiring.{u3} S] [_inst_3 : NonUnitalRingHomClass.{u1, u2, u3} F R S _inst_1 _inst_2] (f : F), (Function.Bijective.{succ u2, succ u3} R S (coeFn.{succ u1, max (succ u2) (succ u3)} F (fun (_x : F) => R -> S) (FunLike.hasCoeToFun.{succ u1, succ u2, succ u3} F R (fun (_x : R) => S) (MulHomClass.toFunLike.{u1, u2, u3} F R S (Distrib.toHasMul.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toHasMul.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2)) (NonUnitalRingHomClass.toMulHomClass.{u1, u2, u3} F R S _inst_1 _inst_2 _inst_3))) f)) -> (RingEquiv.{u2, u3} R S (Distrib.toHasMul.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toHasAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toHasMul.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2)) (Distrib.toHasAdd.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2)))
 but is expected to have type
-  forall {F : Type.{u1}} {R : Type.{u2}} {S : Type.{u3}} [_inst_1 : NonUnitalNonAssocSemiring.{u2} R] [_inst_2 : NonUnitalNonAssocSemiring.{u3} S] [_inst_3 : NonUnitalRingHomClass.{u1, u2, u3} F R S _inst_1 _inst_2] (f : F), (Function.Bijective.{succ u2, succ u3} R S (FunLike.coe.{succ u1, succ u2, succ u3} F R (fun (_x : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2398 : R) => S) _x) (MulHomClass.toFunLike.{u1, u2, u3} F R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u3} S _inst_2) (NonUnitalRingHomClass.toMulHomClass.{u1, u2, u3} F R S _inst_1 _inst_2 _inst_3)) f)) -> (RingEquiv.{u2, u3} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u3} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2)))
+  forall {F : Type.{u1}} {R : Type.{u2}} {S : Type.{u3}} [_inst_1 : NonUnitalNonAssocSemiring.{u2} R] [_inst_2 : NonUnitalNonAssocSemiring.{u3} S] [_inst_3 : NonUnitalRingHomClass.{u1, u2, u3} F R S _inst_1 _inst_2] (f : F), (Function.Bijective.{succ u2, succ u3} R S (FunLike.coe.{succ u1, succ u2, succ u3} F R (fun (_x : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2372 : R) => S) _x) (MulHomClass.toFunLike.{u1, u2, u3} F R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u3} S _inst_2) (NonUnitalRingHomClass.toMulHomClass.{u1, u2, u3} F R S _inst_1 _inst_2 _inst_3)) f)) -> (RingEquiv.{u2, u3} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u3} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2)))
 Case conversion may be inaccurate. Consider using '#align ring_equiv.of_bijective RingEquiv.ofBijectiveₓ'. -/
 /-- Produce a ring isomorphism from a bijective ring homomorphism. -/
 noncomputable def ofBijective [NonUnitalRingHomClass F R S] (f : F) (hf : Function.Bijective f) :
@@ -748,7 +748,7 @@ noncomputable def ofBijective [NonUnitalRingHomClass F R S] (f : F) (hf : Functi
 lean 3 declaration is
   forall {F : Type.{u1}} {R : Type.{u2}} {S : Type.{u3}} [_inst_1 : NonUnitalNonAssocSemiring.{u2} R] [_inst_2 : NonUnitalNonAssocSemiring.{u3} S] [_inst_3 : NonUnitalRingHomClass.{u1, u2, u3} F R S _inst_1 _inst_2] (f : F) (hf : Function.Bijective.{succ u2, succ u3} R S (coeFn.{succ u1, max (succ u2) (succ u3)} F (fun (_x : F) => R -> S) (FunLike.hasCoeToFun.{succ u1, succ u2, succ u3} F R (fun (_x : R) => S) (MulHomClass.toFunLike.{u1, u2, u3} F R S (Distrib.toHasMul.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toHasMul.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2)) (NonUnitalRingHomClass.toMulHomClass.{u1, u2, u3} F R S _inst_1 _inst_2 _inst_3))) f)), Eq.{max (succ u2) (succ u3)} ((fun (_x : RingEquiv.{u2, u3} R S (Distrib.toHasMul.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toHasAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toHasMul.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2)) (Distrib.toHasAdd.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2))) => R -> S) (RingEquiv.ofBijective.{u1, u2, u3} F R S _inst_1 _inst_2 _inst_3 f hf)) (coeFn.{max (succ u2) (succ u3), max (succ u2) (succ u3)} (RingEquiv.{u2, u3} R S (Distrib.toHasMul.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toHasAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toHasMul.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2)) (Distrib.toHasAdd.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2))) (fun (_x : RingEquiv.{u2, u3} R S (Distrib.toHasMul.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toHasAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toHasMul.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2)) (Distrib.toHasAdd.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2))) => R -> S) (RingEquiv.hasCoeToFun.{u2, u3} R S (Distrib.toHasMul.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toHasAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toHasMul.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2)) (Distrib.toHasAdd.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2))) (RingEquiv.ofBijective.{u1, u2, u3} F R S _inst_1 _inst_2 _inst_3 f hf)) (coeFn.{succ u1, max (succ u2) (succ u3)} F (fun (_x : F) => R -> S) (FunLike.hasCoeToFun.{succ u1, succ u2, succ u3} F R (fun (_x : R) => S) (MulHomClass.toFunLike.{u1, u2, u3} F R S (Distrib.toHasMul.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toHasMul.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2)) (NonUnitalRingHomClass.toMulHomClass.{u1, u2, u3} F R S _inst_1 _inst_2 _inst_3))) f)
 but is expected to have type
-  forall {F : Type.{u3}} {R : Type.{u2}} {S : Type.{u1}} [_inst_1 : NonUnitalNonAssocSemiring.{u2} R] [_inst_2 : NonUnitalNonAssocSemiring.{u1} S] [_inst_3 : NonUnitalRingHomClass.{u3, u2, u1} F R S _inst_1 _inst_2] (f : F) (hf : Function.Bijective.{succ u2, succ u1} R S (FunLike.coe.{succ u3, succ u2, succ u1} F R (fun (_x : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2398 : R) => S) _x) (MulHomClass.toFunLike.{u3, u2, u1} F R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (NonUnitalRingHomClass.toMulHomClass.{u3, u2, u1} F R S _inst_1 _inst_2 _inst_3)) f)), Eq.{max (succ u2) (succ u1)} (forall (a : R), (fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) a) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R (fun (_x : R) => (fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) _x) (EmbeddingLike.toFunLike.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (EquivLike.toEmbeddingLike.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (MulEquivClass.toEquivLike.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (RingEquivClass.toMulEquivClass.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2)) (RingEquiv.instRingEquivClassRingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))))))) (RingEquiv.ofBijective.{u3, u2, u1} F R S _inst_1 _inst_2 _inst_3 f hf)) (FunLike.coe.{succ u3, succ u2, succ u1} F R (fun (_x : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2398 : R) => S) _x) (MulHomClass.toFunLike.{u3, u2, u1} F R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (NonUnitalRingHomClass.toMulHomClass.{u3, u2, u1} F R S _inst_1 _inst_2 _inst_3)) f)
+  forall {F : Type.{u3}} {R : Type.{u2}} {S : Type.{u1}} [_inst_1 : NonUnitalNonAssocSemiring.{u2} R] [_inst_2 : NonUnitalNonAssocSemiring.{u1} S] [_inst_3 : NonUnitalRingHomClass.{u3, u2, u1} F R S _inst_1 _inst_2] (f : F) (hf : Function.Bijective.{succ u2, succ u1} R S (FunLike.coe.{succ u3, succ u2, succ u1} F R (fun (_x : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2372 : R) => S) _x) (MulHomClass.toFunLike.{u3, u2, u1} F R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (NonUnitalRingHomClass.toMulHomClass.{u3, u2, u1} F R S _inst_1 _inst_2 _inst_3)) f)), Eq.{max (succ u2) (succ u1)} (forall (a : R), (fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) a) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R (fun (_x : R) => (fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) _x) (EmbeddingLike.toFunLike.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (EquivLike.toEmbeddingLike.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (MulEquivClass.toEquivLike.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (RingEquivClass.toMulEquivClass.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2)) (RingEquiv.instRingEquivClassRingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))))))) (RingEquiv.ofBijective.{u3, u2, u1} F R S _inst_1 _inst_2 _inst_3 f hf)) (FunLike.coe.{succ u3, succ u2, succ u1} F R (fun (_x : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2372 : R) => S) _x) (MulHomClass.toFunLike.{u3, u2, u1} F R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (NonUnitalRingHomClass.toMulHomClass.{u3, u2, u1} F R S _inst_1 _inst_2 _inst_3)) f)
 Case conversion may be inaccurate. Consider using '#align ring_equiv.coe_of_bijective RingEquiv.coe_ofBijectiveₓ'. -/
 @[simp]
 theorem coe_ofBijective [NonUnitalRingHomClass F R S] (f : F) (hf : Function.Bijective f) :
@@ -760,7 +760,7 @@ theorem coe_ofBijective [NonUnitalRingHomClass F R S] (f : F) (hf : Function.Bij
 lean 3 declaration is
   forall {F : Type.{u1}} {R : Type.{u2}} {S : Type.{u3}} [_inst_1 : NonUnitalNonAssocSemiring.{u2} R] [_inst_2 : NonUnitalNonAssocSemiring.{u3} S] [_inst_3 : NonUnitalRingHomClass.{u1, u2, u3} F R S _inst_1 _inst_2] (f : F) (hf : Function.Bijective.{succ u2, succ u3} R S (coeFn.{succ u1, max (succ u2) (succ u3)} F (fun (_x : F) => R -> S) (FunLike.hasCoeToFun.{succ u1, succ u2, succ u3} F R (fun (_x : R) => S) (MulHomClass.toFunLike.{u1, u2, u3} F R S (Distrib.toHasMul.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toHasMul.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2)) (NonUnitalRingHomClass.toMulHomClass.{u1, u2, u3} F R S _inst_1 _inst_2 _inst_3))) f)) (x : R), Eq.{succ u3} S (coeFn.{max (succ u2) (succ u3), max (succ u2) (succ u3)} (RingEquiv.{u2, u3} R S (Distrib.toHasMul.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toHasAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toHasMul.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2)) (Distrib.toHasAdd.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2))) (fun (_x : RingEquiv.{u2, u3} R S (Distrib.toHasMul.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toHasAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toHasMul.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2)) (Distrib.toHasAdd.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2))) => R -> S) (RingEquiv.hasCoeToFun.{u2, u3} R S (Distrib.toHasMul.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toHasAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toHasMul.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2)) (Distrib.toHasAdd.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2))) (RingEquiv.ofBijective.{u1, u2, u3} F R S _inst_1 _inst_2 _inst_3 f hf) x) (coeFn.{succ u1, max (succ u2) (succ u3)} F (fun (_x : F) => R -> S) (FunLike.hasCoeToFun.{succ u1, succ u2, succ u3} F R (fun (_x : R) => S) (MulHomClass.toFunLike.{u1, u2, u3} F R S (Distrib.toHasMul.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toHasMul.{u3} S (NonUnitalNonAssocSemiring.toDistrib.{u3} S _inst_2)) (NonUnitalRingHomClass.toMulHomClass.{u1, u2, u3} F R S _inst_1 _inst_2 _inst_3))) f x)
 but is expected to have type
-  forall {F : Type.{u3}} {R : Type.{u2}} {S : Type.{u1}} [_inst_1 : NonUnitalNonAssocSemiring.{u2} R] [_inst_2 : NonUnitalNonAssocSemiring.{u1} S] [_inst_3 : NonUnitalRingHomClass.{u3, u2, u1} F R S _inst_1 _inst_2] (f : F) (hf : Function.Bijective.{succ u2, succ u1} R S (FunLike.coe.{succ u3, succ u2, succ u1} F R (fun (_x : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2398 : R) => S) _x) (MulHomClass.toFunLike.{u3, u2, u1} F R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (NonUnitalRingHomClass.toMulHomClass.{u3, u2, u1} F R S _inst_1 _inst_2 _inst_3)) f)) (x : R), Eq.{succ u1} ((fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) x) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R (fun (_x : R) => (fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) _x) (EmbeddingLike.toFunLike.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (EquivLike.toEmbeddingLike.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (MulEquivClass.toEquivLike.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (RingEquivClass.toMulEquivClass.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2)) (RingEquiv.instRingEquivClassRingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))))))) (RingEquiv.ofBijective.{u3, u2, u1} F R S _inst_1 _inst_2 _inst_3 f hf) x) (FunLike.coe.{succ u3, succ u2, succ u1} F R (fun (_x : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2398 : R) => S) _x) (MulHomClass.toFunLike.{u3, u2, u1} F R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (NonUnitalRingHomClass.toMulHomClass.{u3, u2, u1} F R S _inst_1 _inst_2 _inst_3)) f x)
+  forall {F : Type.{u3}} {R : Type.{u2}} {S : Type.{u1}} [_inst_1 : NonUnitalNonAssocSemiring.{u2} R] [_inst_2 : NonUnitalNonAssocSemiring.{u1} S] [_inst_3 : NonUnitalRingHomClass.{u3, u2, u1} F R S _inst_1 _inst_2] (f : F) (hf : Function.Bijective.{succ u2, succ u1} R S (FunLike.coe.{succ u3, succ u2, succ u1} F R (fun (_x : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2372 : R) => S) _x) (MulHomClass.toFunLike.{u3, u2, u1} F R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (NonUnitalRingHomClass.toMulHomClass.{u3, u2, u1} F R S _inst_1 _inst_2 _inst_3)) f)) (x : R), Eq.{succ u1} ((fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) x) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R (fun (_x : R) => (fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) _x) (EmbeddingLike.toFunLike.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (EquivLike.toEmbeddingLike.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (MulEquivClass.toEquivLike.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (RingEquivClass.toMulEquivClass.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2)) (RingEquiv.instRingEquivClassRingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))))))) (RingEquiv.ofBijective.{u3, u2, u1} F R S _inst_1 _inst_2 _inst_3 f hf) x) (FunLike.coe.{succ u3, succ u2, succ u1} F R (fun (_x : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2372 : R) => S) _x) (MulHomClass.toFunLike.{u3, u2, u1} F R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (NonUnitalRingHomClass.toMulHomClass.{u3, u2, u1} F R S _inst_1 _inst_2 _inst_3)) f x)
 Case conversion may be inaccurate. Consider using '#align ring_equiv.of_bijective_apply RingEquiv.ofBijective_applyₓ'. -/
 theorem ofBijective_apply [NonUnitalRingHomClass F R S] (f : F) (hf : Function.Bijective f)
     (x : R) : ofBijective f hf x = f x :=
@@ -1062,7 +1062,7 @@ theorem toNonUnitalRingHom_eq_coe (f : R ≃+* S) : f.toNonUnitalRingHom = ↑f
 lean 3 declaration is
   forall {R : Type.{u1}} {S : Type.{u2}} [_inst_1 : NonUnitalNonAssocSemiring.{u1} R] [_inst_2 : NonUnitalNonAssocSemiring.{u2} S] (f : RingEquiv.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2)) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2))), Eq.{max (succ u1) (succ u2)} (R -> S) (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} R S _inst_1 _inst_2) (fun (_x : NonUnitalRingHom.{u1, u2} R S _inst_1 _inst_2) => R -> S) (NonUnitalRingHom.hasCoeToFun.{u1, u2} R S _inst_1 _inst_2) ((fun (a : Sort.{max (succ u1) (succ u2)}) (b : Sort.{max (succ u1) (succ u2)}) [self : HasLiftT.{max (succ u1) (succ u2), max (succ u1) (succ u2)} a b] => self.0) (RingEquiv.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2)) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2))) (NonUnitalRingHom.{u1, u2} R S _inst_1 _inst_2) (HasLiftT.mk.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingEquiv.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2)) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2))) (NonUnitalRingHom.{u1, u2} R S _inst_1 _inst_2) (CoeTCₓ.coe.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingEquiv.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2)) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2))) (NonUnitalRingHom.{u1, u2} R S _inst_1 _inst_2) (NonUnitalRingHom.hasCoeT.{max u1 u2, u1, u2} (RingEquiv.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2)) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2))) R S _inst_1 _inst_2 (RingEquivClass.toNonUnitalRingHomClass.{max u1 u2, u1, u2} (RingEquiv.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2)) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2))) R S _inst_1 _inst_2 (RingEquiv.ringEquivClass.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2)) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2))))))) f)) (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingEquiv.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2)) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2))) (fun (_x : RingEquiv.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2)) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2))) => R -> S) (RingEquiv.hasCoeToFun.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2)) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2))) f)
 but is expected to have type
-  forall {R : Type.{u2}} {S : Type.{u1}} [_inst_1 : NonUnitalNonAssocSemiring.{u2} R] [_inst_2 : NonUnitalNonAssocSemiring.{u1} S] (f : RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))), Eq.{max (succ u2) (succ u1)} (forall (ᾰ : R), (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2398 : R) => S) ᾰ) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R (fun (_x : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2398 : R) => S) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R S _inst_1 _inst_2 (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2))) (NonUnitalRingHomClass.toNonUnitalRingHom.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S _inst_1 _inst_2 (RingEquivClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S _inst_1 _inst_2 (RingEquiv.instRingEquivClassRingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2)))) f)) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R (fun (_x : R) => (fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) _x) (EmbeddingLike.toFunLike.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (EquivLike.toEmbeddingLike.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (MulEquivClass.toEquivLike.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (RingEquivClass.toMulEquivClass.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2)) (RingEquiv.instRingEquivClassRingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))))))) f)
+  forall {R : Type.{u2}} {S : Type.{u1}} [_inst_1 : NonUnitalNonAssocSemiring.{u2} R] [_inst_2 : NonUnitalNonAssocSemiring.{u1} S] (f : RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))), Eq.{max (succ u2) (succ u1)} (forall (ᾰ : R), (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2372 : R) => S) ᾰ) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R (fun (_x : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2372 : R) => S) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R S _inst_1 _inst_2 (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2))) (NonUnitalRingHomClass.toNonUnitalRingHom.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S _inst_1 _inst_2 (RingEquivClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S _inst_1 _inst_2 (RingEquiv.instRingEquivClassRingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2)))) f)) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R (fun (_x : R) => (fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) _x) (EmbeddingLike.toFunLike.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (EquivLike.toEmbeddingLike.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (MulEquivClass.toEquivLike.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (RingEquivClass.toMulEquivClass.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2)) (RingEquiv.instRingEquivClassRingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))))))) f)
 Case conversion may be inaccurate. Consider using '#align ring_equiv.coe_to_non_unital_ring_hom RingEquiv.coe_toNonUnitalRingHomₓ'. -/
 @[simp, norm_cast]
 theorem coe_toNonUnitalRingHom (f : R ≃+* S) : ⇑(f : R →ₙ+* S) = f :=
@@ -1091,7 +1091,7 @@ theorem toNonUnitalRingHom_refl : (RingEquiv.refl R).toNonUnitalRingHom = NonUni
 lean 3 declaration is
   forall {R : Type.{u1}} {S : Type.{u2}} [_inst_1 : NonUnitalNonAssocSemiring.{u1} R] [_inst_2 : NonUnitalNonAssocSemiring.{u2} S] (e : RingEquiv.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2)) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2))) (y : S), Eq.{succ u2} S (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} R S _inst_1 _inst_2) (fun (_x : NonUnitalRingHom.{u1, u2} R S _inst_1 _inst_2) => R -> S) (NonUnitalRingHom.hasCoeToFun.{u1, u2} R S _inst_1 _inst_2) (RingEquiv.toNonUnitalRingHom.{u1, u2} R S _inst_1 _inst_2 e) (coeFn.{max (succ u2) (succ u1), max (succ u2) (succ u1)} (NonUnitalRingHom.{u2, u1} S R _inst_2 _inst_1) (fun (_x : NonUnitalRingHom.{u2, u1} S R _inst_2 _inst_1) => S -> R) (NonUnitalRingHom.hasCoeToFun.{u2, u1} S R _inst_2 _inst_1) (RingEquiv.toNonUnitalRingHom.{u2, u1} S R _inst_2 _inst_1 (RingEquiv.symm.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2)) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2)) e)) y)) y
 but is expected to have type
-  forall {R : Type.{u2}} {S : Type.{u1}} [_inst_1 : NonUnitalNonAssocSemiring.{u2} R] [_inst_2 : NonUnitalNonAssocSemiring.{u1} S] (e : RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) (y : S), Eq.{succ u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2398 : R) => S) (FunLike.coe.{max (succ u2) (succ u1), succ u1, succ u2} (NonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1) S (fun (a : S) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2398 : S) => R) a) (MulHomClass.toFunLike.{max u2 u1, u1, u2} (NonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1) S R (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u1, u2} (NonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1) S R _inst_2 _inst_1 (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1))) (RingEquiv.toNonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1 (RingEquiv.symm.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2)) e)) y)) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R (fun (_x : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2398 : R) => S) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R S _inst_1 _inst_2 (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2))) (RingEquiv.toNonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2 e) (FunLike.coe.{max (succ u2) (succ u1), succ u1, succ u2} (NonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1) S (fun (_x : S) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2398 : S) => R) _x) (MulHomClass.toFunLike.{max u2 u1, u1, u2} (NonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1) S R (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u1, u2} (NonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1) S R _inst_2 _inst_1 (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1))) (RingEquiv.toNonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1 (RingEquiv.symm.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2)) e)) y)) y
+  forall {R : Type.{u2}} {S : Type.{u1}} [_inst_1 : NonUnitalNonAssocSemiring.{u2} R] [_inst_2 : NonUnitalNonAssocSemiring.{u1} S] (e : RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) (y : S), Eq.{succ u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2372 : R) => S) (FunLike.coe.{max (succ u2) (succ u1), succ u1, succ u2} (NonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1) S (fun (a : S) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2372 : S) => R) a) (MulHomClass.toFunLike.{max u2 u1, u1, u2} (NonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1) S R (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u1, u2} (NonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1) S R _inst_2 _inst_1 (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1))) (RingEquiv.toNonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1 (RingEquiv.symm.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2)) e)) y)) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R (fun (_x : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2372 : R) => S) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R S _inst_1 _inst_2 (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2))) (RingEquiv.toNonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2 e) (FunLike.coe.{max (succ u2) (succ u1), succ u1, succ u2} (NonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1) S (fun (_x : S) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2372 : S) => R) _x) (MulHomClass.toFunLike.{max u2 u1, u1, u2} (NonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1) S R (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u1, u2} (NonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1) S R _inst_2 _inst_1 (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1))) (RingEquiv.toNonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1 (RingEquiv.symm.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2)) e)) y)) y
 Case conversion may be inaccurate. Consider using '#align ring_equiv.to_non_unital_ring_hom_apply_symm_to_non_unital_ring_hom_apply RingEquiv.toNonUnitalRingHom_apply_symm_toNonUnitalRingHom_applyₓ'. -/
 @[simp]
 theorem toNonUnitalRingHom_apply_symm_toNonUnitalRingHom_apply (e : R ≃+* S) :
@@ -1103,7 +1103,7 @@ theorem toNonUnitalRingHom_apply_symm_toNonUnitalRingHom_apply (e : R ≃+* S) :
 lean 3 declaration is
   forall {R : Type.{u1}} {S : Type.{u2}} [_inst_1 : NonUnitalNonAssocSemiring.{u1} R] [_inst_2 : NonUnitalNonAssocSemiring.{u2} S] (e : RingEquiv.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2)) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2))) (x : R), Eq.{succ u1} R (coeFn.{max (succ u2) (succ u1), max (succ u2) (succ u1)} (NonUnitalRingHom.{u2, u1} S R _inst_2 _inst_1) (fun (_x : NonUnitalRingHom.{u2, u1} S R _inst_2 _inst_1) => S -> R) (NonUnitalRingHom.hasCoeToFun.{u2, u1} S R _inst_2 _inst_1) (RingEquiv.toNonUnitalRingHom.{u2, u1} S R _inst_2 _inst_1 (RingEquiv.symm.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R _inst_1)) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2)) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S _inst_2)) e)) (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (NonUnitalRingHom.{u1, u2} R S _inst_1 _inst_2) (fun (_x : NonUnitalRingHom.{u1, u2} R S _inst_1 _inst_2) => R -> S) (NonUnitalRingHom.hasCoeToFun.{u1, u2} R S _inst_1 _inst_2) (RingEquiv.toNonUnitalRingHom.{u1, u2} R S _inst_1 _inst_2 e) x)) x
 but is expected to have type
-  forall {R : Type.{u2}} {S : Type.{u1}} [_inst_1 : NonUnitalNonAssocSemiring.{u2} R] [_inst_2 : NonUnitalNonAssocSemiring.{u1} S] (e : RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) (x : R), Eq.{succ u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2398 : S) => R) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R (fun (a : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2398 : R) => S) a) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R S _inst_1 _inst_2 (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2))) (RingEquiv.toNonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2 e) x)) (FunLike.coe.{max (succ u2) (succ u1), succ u1, succ u2} (NonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1) S (fun (_x : S) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2398 : S) => R) _x) (MulHomClass.toFunLike.{max u2 u1, u1, u2} (NonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1) S R (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u1, u2} (NonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1) S R _inst_2 _inst_1 (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1))) (RingEquiv.toNonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1 (RingEquiv.symm.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2)) e)) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R (fun (_x : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2398 : R) => S) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R S _inst_1 _inst_2 (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2))) (RingEquiv.toNonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2 e) x)) x
+  forall {R : Type.{u2}} {S : Type.{u1}} [_inst_1 : NonUnitalNonAssocSemiring.{u2} R] [_inst_2 : NonUnitalNonAssocSemiring.{u1} S] (e : RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2))) (x : R), Eq.{succ u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2372 : S) => R) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R (fun (a : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2372 : R) => S) a) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R S _inst_1 _inst_2 (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2))) (RingEquiv.toNonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2 e) x)) (FunLike.coe.{max (succ u2) (succ u1), succ u1, succ u2} (NonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1) S (fun (_x : S) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2372 : S) => R) _x) (MulHomClass.toFunLike.{max u2 u1, u1, u2} (NonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1) S R (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u1, u2} (NonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1) S R _inst_2 _inst_1 (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1))) (RingEquiv.toNonUnitalRingHom.{u1, u2} S R _inst_2 _inst_1 (RingEquiv.symm.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R _inst_1)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S _inst_2)) e)) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R (fun (_x : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2372 : R) => S) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R S (NonUnitalNonAssocSemiring.toMul.{u2} R _inst_1) (NonUnitalNonAssocSemiring.toMul.{u1} S _inst_2) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (NonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2) R S _inst_1 _inst_2 (NonUnitalRingHom.instNonUnitalRingHomClassNonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2))) (RingEquiv.toNonUnitalRingHom.{u2, u1} R S _inst_1 _inst_2 e) x)) x
 Case conversion may be inaccurate. Consider using '#align ring_equiv.symm_to_non_unital_ring_hom_apply_to_non_unital_ring_hom_apply RingEquiv.symm_toNonUnitalRingHom_apply_toNonUnitalRingHom_applyₓ'. -/
 @[simp]
 theorem symm_toNonUnitalRingHom_apply_toNonUnitalRingHom_apply (e : R ≃+* S) :
@@ -1202,7 +1202,7 @@ theorem toRingHom_eq_coe (f : R ≃+* S) : f.toRingHom = ↑f :=
 lean 3 declaration is
   forall {R : Type.{u1}} {S : Type.{u2}} [_inst_1 : NonAssocSemiring.{u1} R] [_inst_2 : NonAssocSemiring.{u2} S] (f : RingEquiv.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2))) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2)))), Eq.{max (succ u1) (succ u2)} (R -> S) (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingHom.{u1, u2} R S _inst_1 _inst_2) (fun (_x : RingHom.{u1, u2} R S _inst_1 _inst_2) => R -> S) (RingHom.hasCoeToFun.{u1, u2} R S _inst_1 _inst_2) ((fun (a : Sort.{max (succ u1) (succ u2)}) (b : Sort.{max (succ u1) (succ u2)}) [self : HasLiftT.{max (succ u1) (succ u2), max (succ u1) (succ u2)} a b] => self.0) (RingEquiv.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2))) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2)))) (RingHom.{u1, u2} R S _inst_1 _inst_2) (HasLiftT.mk.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingEquiv.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2))) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2)))) (RingHom.{u1, u2} R S _inst_1 _inst_2) (CoeTCₓ.coe.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingEquiv.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2))) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2)))) 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(NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2)))) => R -> S) (RingEquiv.hasCoeToFun.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2))) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2)))) f)
 but is expected to have type
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(NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)))) R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2))) (RingEquiv.instRingEquivClassRingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)))))))) f)
+  forall {R : Type.{u2}} {S : Type.{u1}} [_inst_1 : NonAssocSemiring.{u2} R] [_inst_2 : NonAssocSemiring.{u1} S] (f : RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)))), Eq.{max (succ u2) (succ u1)} (forall (ᾰ : R), (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2372 : R) => S) ᾰ) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R (fun (_x : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2372 : R) => S) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R S _inst_1 _inst_2 (RingHom.instRingHomClassRingHom.{u2, u1} R S _inst_1 _inst_2)))) (RingHomClass.toRingHom.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R 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(NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2))))) f)) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)))) R (fun (_x : R) => (fun (x._@.Mathlib.Data.FunLike.Embedding._hyg.19 : R) => S) _x) (EmbeddingLike.toFunLike.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)))) R S (EquivLike.toEmbeddingLike.{max (succ u2) (succ u1), succ u2, succ u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)))) R S (MulEquivClass.toEquivLike.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)))) R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (RingEquivClass.toMulEquivClass.{max u2 u1, u2, u1} (RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)))) R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2))) (RingEquiv.instRingEquivClassRingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)))))))) f)
 Case conversion may be inaccurate. Consider using '#align ring_equiv.coe_to_ring_hom RingEquiv.coe_toRingHomₓ'. -/
 @[simp, norm_cast]
 theorem coe_toRingHom (f : R ≃+* S) : ⇑(f : R →+* S) = f :=
@@ -1313,7 +1313,7 @@ theorem toAddMonoidHom_refl : (RingEquiv.refl R).toAddMonoidHom = AddMonoidHom.i
 lean 3 declaration is
   forall {R : Type.{u1}} {S : Type.{u2}} [_inst_1 : NonAssocSemiring.{u1} R] [_inst_2 : NonAssocSemiring.{u2} S] (e : RingEquiv.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2))) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2)))) (y : S), Eq.{succ u2} S (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingHom.{u1, u2} R S _inst_1 _inst_2) (fun (_x : RingHom.{u1, u2} R S _inst_1 _inst_2) => R -> S) (RingHom.hasCoeToFun.{u1, u2} R S _inst_1 _inst_2) (RingEquiv.toRingHom.{u1, u2} R S _inst_1 _inst_2 e) (coeFn.{max (succ u2) (succ u1), max (succ u2) (succ u1)} (RingHom.{u2, u1} S R _inst_2 _inst_1) (fun (_x : RingHom.{u2, u1} S R _inst_2 _inst_1) => S -> R) (RingHom.hasCoeToFun.{u2, u1} S R _inst_2 _inst_1) (RingEquiv.toRingHom.{u2, u1} S R _inst_2 _inst_1 (RingEquiv.symm.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2))) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2))) e)) y)) y
 but is expected to have type
-  forall {R : Type.{u2}} {S : Type.{u1}} [_inst_1 : NonAssocSemiring.{u2} R] [_inst_2 : NonAssocSemiring.{u1} S] (e : RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)))) (y : S), Eq.{succ u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2398 : R) => S) (FunLike.coe.{max (succ u2) (succ u1), succ u1, succ u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S (fun (a : S) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2398 : S) => R) a) (MulHomClass.toFunLike.{max u2 u1, u1, u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S R (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u1, u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u1, u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S R _inst_2 _inst_1 (RingHom.instRingHomClassRingHom.{u1, u2} S R _inst_2 _inst_1)))) (RingEquiv.toRingHom.{u1, u2} S R _inst_2 _inst_1 (RingEquiv.symm.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2))) e)) y)) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R (fun (_x : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2398 : R) => S) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R S _inst_1 _inst_2 (RingHom.instRingHomClassRingHom.{u2, u1} R S _inst_1 _inst_2)))) (RingEquiv.toRingHom.{u2, u1} R S _inst_1 _inst_2 e) (FunLike.coe.{max (succ u2) (succ u1), succ u1, succ u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S (fun (_x : S) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2398 : S) => R) _x) (MulHomClass.toFunLike.{max u2 u1, u1, u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S R (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u1, u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u1, u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S R _inst_2 _inst_1 (RingHom.instRingHomClassRingHom.{u1, u2} S R _inst_2 _inst_1)))) (RingEquiv.toRingHom.{u1, u2} S R _inst_2 _inst_1 (RingEquiv.symm.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2))) e)) y)) y
+  forall {R : Type.{u2}} {S : Type.{u1}} [_inst_1 : NonAssocSemiring.{u2} R] [_inst_2 : NonAssocSemiring.{u1} S] (e : RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)))) (y : S), Eq.{succ u1} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2372 : R) => S) (FunLike.coe.{max (succ u2) (succ u1), succ u1, succ u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S (fun (a : S) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2372 : S) => R) a) (MulHomClass.toFunLike.{max u2 u1, u1, u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S R (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u1, u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u1, u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S R _inst_2 _inst_1 (RingHom.instRingHomClassRingHom.{u1, u2} S R _inst_2 _inst_1)))) (RingEquiv.toRingHom.{u1, u2} S R _inst_2 _inst_1 (RingEquiv.symm.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2))) e)) y)) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R (fun (_x : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2372 : R) => S) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R S _inst_1 _inst_2 (RingHom.instRingHomClassRingHom.{u2, u1} R S _inst_1 _inst_2)))) (RingEquiv.toRingHom.{u2, u1} R S _inst_1 _inst_2 e) (FunLike.coe.{max (succ u2) (succ u1), succ u1, succ u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S (fun (_x : S) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2372 : S) => R) _x) (MulHomClass.toFunLike.{max u2 u1, u1, u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S R (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u1, u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u1, u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S R _inst_2 _inst_1 (RingHom.instRingHomClassRingHom.{u1, u2} S R _inst_2 _inst_1)))) (RingEquiv.toRingHom.{u1, u2} S R _inst_2 _inst_1 (RingEquiv.symm.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2))) e)) y)) y
 Case conversion may be inaccurate. Consider using '#align ring_equiv.to_ring_hom_apply_symm_to_ring_hom_apply RingEquiv.toRingHom_apply_symm_toRingHom_applyₓ'. -/
 @[simp]
 theorem toRingHom_apply_symm_toRingHom_apply (e : R ≃+* S) :
@@ -1325,7 +1325,7 @@ theorem toRingHom_apply_symm_toRingHom_apply (e : R ≃+* S) :
 lean 3 declaration is
   forall {R : Type.{u1}} {S : Type.{u2}} [_inst_1 : NonAssocSemiring.{u1} R] [_inst_2 : NonAssocSemiring.{u2} S] (e : RingEquiv.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2))) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2)))) (x : R), Eq.{succ u1} R (coeFn.{max (succ u2) (succ u1), max (succ u2) (succ u1)} (RingHom.{u2, u1} S R _inst_2 _inst_1) (fun (_x : RingHom.{u2, u1} S R _inst_2 _inst_1) => S -> R) (RingHom.hasCoeToFun.{u2, u1} S R _inst_2 _inst_1) (RingEquiv.toRingHom.{u2, u1} S R _inst_2 _inst_1 (RingEquiv.symm.{u1, u2} R S (Distrib.toHasMul.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasAdd.{u1} R (NonUnitalNonAssocSemiring.toDistrib.{u1} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} R _inst_1))) (Distrib.toHasMul.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2))) (Distrib.toHasAdd.{u2} S (NonUnitalNonAssocSemiring.toDistrib.{u2} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} S _inst_2))) e)) (coeFn.{max (succ u1) (succ u2), max (succ u1) (succ u2)} (RingHom.{u1, u2} R S _inst_1 _inst_2) (fun (_x : RingHom.{u1, u2} R S _inst_1 _inst_2) => R -> S) (RingHom.hasCoeToFun.{u1, u2} R S _inst_1 _inst_2) (RingEquiv.toRingHom.{u1, u2} R S _inst_1 _inst_2 e) x)) x
 but is expected to have type
-  forall {R : Type.{u2}} {S : Type.{u1}} [_inst_1 : NonAssocSemiring.{u2} R] [_inst_2 : NonAssocSemiring.{u1} S] (e : RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)))) (x : R), Eq.{succ u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2398 : S) => R) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R (fun (a : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2398 : R) => S) a) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R S _inst_1 _inst_2 (RingHom.instRingHomClassRingHom.{u2, u1} R S _inst_1 _inst_2)))) (RingEquiv.toRingHom.{u2, u1} R S _inst_1 _inst_2 e) x)) (FunLike.coe.{max (succ u2) (succ u1), succ u1, succ u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S (fun (_x : S) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2398 : S) => R) _x) (MulHomClass.toFunLike.{max u2 u1, u1, u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S R (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u1, u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u1, u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S R _inst_2 _inst_1 (RingHom.instRingHomClassRingHom.{u1, u2} S R _inst_2 _inst_1)))) (RingEquiv.toRingHom.{u1, u2} S R _inst_2 _inst_1 (RingEquiv.symm.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2))) e)) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R (fun (_x : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2398 : R) => S) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R S _inst_1 _inst_2 (RingHom.instRingHomClassRingHom.{u2, u1} R S _inst_1 _inst_2)))) (RingEquiv.toRingHom.{u2, u1} R S _inst_1 _inst_2 e) x)) x
+  forall {R : Type.{u2}} {S : Type.{u1}} [_inst_1 : NonAssocSemiring.{u2} R] [_inst_2 : NonAssocSemiring.{u1} S] (e : RingEquiv.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)))) (x : R), Eq.{succ u2} ((fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2372 : S) => R) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R (fun (a : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2372 : R) => S) a) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R S _inst_1 _inst_2 (RingHom.instRingHomClassRingHom.{u2, u1} R S _inst_1 _inst_2)))) (RingEquiv.toRingHom.{u2, u1} R S _inst_1 _inst_2 e) x)) (FunLike.coe.{max (succ u2) (succ u1), succ u1, succ u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S (fun (_x : S) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2372 : S) => R) _x) (MulHomClass.toFunLike.{max u2 u1, u1, u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S R (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u1, u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u1, u2} (RingHom.{u1, u2} S R _inst_2 _inst_1) S R _inst_2 _inst_1 (RingHom.instRingHomClassRingHom.{u1, u2} S R _inst_2 _inst_1)))) (RingEquiv.toRingHom.{u1, u2} S R _inst_2 _inst_1 (RingEquiv.symm.{u2, u1} R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (Distrib.toAdd.{u2} R (NonUnitalNonAssocSemiring.toDistrib.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1))) (Distrib.toAdd.{u1} S (NonUnitalNonAssocSemiring.toDistrib.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2))) e)) (FunLike.coe.{max (succ u2) (succ u1), succ u2, succ u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R (fun (_x : R) => (fun (x._@.Mathlib.Algebra.Hom.Group._hyg.2372 : R) => S) _x) (MulHomClass.toFunLike.{max u2 u1, u2, u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R S (NonUnitalNonAssocSemiring.toMul.{u2} R (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1)) (NonUnitalNonAssocSemiring.toMul.{u1} S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2)) (NonUnitalRingHomClass.toMulHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R S (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u2} R _inst_1) (NonAssocSemiring.toNonUnitalNonAssocSemiring.{u1} S _inst_2) (RingHomClass.toNonUnitalRingHomClass.{max u2 u1, u2, u1} (RingHom.{u2, u1} R S _inst_1 _inst_2) R S _inst_1 _inst_2 (RingHom.instRingHomClassRingHom.{u2, u1} R S _inst_1 _inst_2)))) (RingEquiv.toRingHom.{u2, u1} R S _inst_1 _inst_2 e) x)) x
 Case conversion may be inaccurate. Consider using '#align ring_equiv.symm_to_ring_hom_apply_to_ring_hom_apply RingEquiv.symm_toRingHom_apply_toRingHom_applyₓ'. -/
 @[simp]
 theorem symm_toRingHom_apply_toRingHom_apply (e : R ≃+* S) :

mathlib commit https://github.com/leanprover-community/mathlib/commit/4c586d291f189eecb9d00581aeb3dd998ac34442

@@ -396,16 +396,16 @@ protected def symm (e : R ≃+* S) : S ≃+* R :=
   { e.toMulEquiv.symm, e.toAddEquiv.symm with }
 #align ring_equiv.symm RingEquiv.symm
 
-/- warning: ring_equiv.simps.symm_apply -> RingEquiv.Simps.symmApply is a dubious translation:
+/- warning: ring_equiv.simps.symm_apply -> RingEquiv.Simps.symm_apply is a dubious translation:
 lean 3 declaration is
   forall {R : Type.{u1}} {S : Type.{u2}} [_inst_1 : Mul.{u1} R] [_inst_2 : Add.{u1} R] [_inst_3 : Mul.{u2} S] [_inst_4 : Add.{u2} S], (RingEquiv.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4) -> S -> R
 but is expected to have type
   forall {R : Type.{u1}} {S : Type.{u2}} [_inst_1 : Mul.{u1} R] [_inst_2 : Mul.{u2} S] [_inst_3 : Add.{u1} R] [_inst_4 : Add.{u2} S], (RingEquiv.{u1, u2} R S _inst_1 _inst_2 _inst_3 _inst_4) -> S -> R
-Case conversion may be inaccurate. Consider using '#align ring_equiv.simps.symm_apply RingEquiv.Simps.symmApplyₓ'. -/
+Case conversion may be inaccurate. Consider using '#align ring_equiv.simps.symm_apply RingEquiv.Simps.symm_applyₓ'. -/
 /-- See Note [custom simps projection] -/
-def Simps.symmApply (e : R ≃+* S) : S → R :=
+def Simps.symm_apply (e : R ≃+* S) : S → R :=
   e.symm
-#align ring_equiv.simps.symm_apply RingEquiv.Simps.symmApply
+#align ring_equiv.simps.symm_apply RingEquiv.Simps.symm_apply
 
 initialize_simps_projections RingEquiv (toFun → apply, invFun → symm_apply)
 

mathlib commit https://github.com/leanprover-community/mathlib/commit/bd9851ca476957ea4549eb19b40e7b5ade9428cc

Purely automatic replacement. If this is in any way controversial; I'm happy to just close this PR.

@@ -846,7 +846,7 @@ end RingEquiv
 
 namespace MulEquiv
 
-/-- Gives a `RingEquiv` from an element of a `MulEquivClass` preserving addition.-/
+/-- Gives a `RingEquiv` from an element of a `MulEquivClass` preserving addition. -/
 def toRingEquiv {R S F : Type*} [Add R] [Add S] [Mul R] [Mul S] [EquivLike F R S]
     [MulEquivClass F R S] (f : F)
     (H : ∀ x y : R, f (x + y) = f x + f y) : R ≃+* S :=
@@ -857,7 +857,7 @@ end MulEquiv
 
 namespace AddEquiv
 
-/-- Gives a `RingEquiv` from an element of an `AddEquivClass` preserving addition.-/
+/-- Gives a `RingEquiv` from an element of an `AddEquivClass` preserving addition. -/
 def toRingEquiv {R S F : Type*} [Add R] [Add S] [Mul R] [Mul S] [EquivLike F R S]
     [AddEquivClass F R S] (f : F)
     (H : ∀ x y : R, f (x * y) = f x * f y) : R ≃+* S :=

Quoting [@digama0](https://github.com/digama0):