# Documentation

Lean.Meta.Tactic.Intro

Similar to mkFreshUserName, but takes into account tactic.hygienic option value. If tactic.hygienic = true, then the current macro scopes are applied to binderName. If not, then an unused (accessible) name (based on binderName) in the local context is used.

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def Lean.Meta.introNCore (mvarId : Lean.MVarId) (n : Nat) (givenNames : ) (useNamesForExplicitOnly : Bool) (preserveBinderNames : Bool) :
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@[inline]
abbrev Lean.MVarId.introN (mvarId : Lean.MVarId) (n : Nat) (givenNames : ) (useNamesForExplicitOnly : ) :

Introduce n binders in the goal mvarId.

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@[inline]
abbrev Lean.Meta.introN (mvarId : Lean.MVarId) (n : Nat) (givenNames : ) (useNamesForExplicitOnly : ) :
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@[inline]
abbrev Lean.MVarId.introNP (mvarId : Lean.MVarId) (n : Nat) :

Introduce n binders in the goal mvarId. The new hypotheses are named using the binder names. The suffix P stands for "preserving.

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@[inline]
abbrev Lean.Meta.introNP (mvarId : Lean.MVarId) (n : Nat) :
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def Lean.MVarId.intro (mvarId : Lean.MVarId) (name : Lean.Name) :

Introduce one binder using name as the the new hypothesis name.

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def Lean.Meta.intro (mvarId : Lean.MVarId) (name : Lean.Name) :
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def Lean.Meta.intro1Core (mvarId : Lean.MVarId) (preserveBinderNames : Bool) :
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@[inline]
abbrev Lean.MVarId.intro1 (mvarId : Lean.MVarId) :

Introduce one object from the goal mvarid, without preserving the name used in the binder. Returns a pair made of the newly introduced variable (which will have an inaccessible name) and the new goal. This will fail if there is nothing to introduce, ie when the goal does not start with a forall, lambda or let.

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@[inline]
abbrev Lean.Meta.intro1 (mvarId : Lean.MVarId) :
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@[inline]
abbrev Lean.MVarId.intro1P (mvarId : Lean.MVarId) :

Introduce one object from the goal mvarid`, preserving the name used in the binder. Returns a pair made of the newly introduced variable and the new goal. This will fail if there is nothing to introduce, ie when the goal does not start with a forall, lambda or let.

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@[inline]
abbrev Lean.Meta.intro1P (mvarId : Lean.MVarId) :
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Introduce as many binders as possible without unfolding definitions.

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