def Lean.Elab.checkNotAlreadyDeclared {m : Type → Type} [Monad m] [MonadEnv m] [MonadError m] [MonadFinally m] [MonadInfoTree m] (declName : Name) : m Unit

Ensure the environment does not contain a declaration with name declName. Recall that a private declaration cannot shadow a non-private one and vice-versa, although they internally have different names.

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inductive Lean.Elab.Visibility : Type

Declaration visibility modifier. That is, whether a declaration is public or private or inherits its visibility from the outer scope.

• regular : Visibility
• private : Visibility
• public : Visibility

instance Lean.Elab.instInhabitedVisibility : Inhabited Visibility

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• Lean.Elab.instInhabitedVisibility = { default := Lean.Elab.Visibility.regular }

instance Lean.Elab.instToStringVisibility : ToString Visibility

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def Lean.Elab.Visibility.isPrivate : Visibility → Bool

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• Lean.Elab.Visibility.private.isPrivate = true
• x✝.isPrivate = false

def Lean.Elab.Visibility.isPublic : Visibility → Bool

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• Lean.Elab.Visibility.public.isPublic = true
• x✝.isPublic = false

def Lean.Elab.Visibility.isInferredPublic (env : Environment) (v : Visibility) : Bool

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• Lean.Elab.Visibility.isInferredPublic env v = if (env.isExporting || !env.header.isModule) = true then !v.isPrivate else v.isPublic

inductive Lean.Elab.RecKind : Type

Whether a declaration is default, partial or nonrec.

• partial : RecKind
• nonrec : RecKind
• default : RecKind

instance Lean.Elab.instInhabitedRecKind : Inhabited RecKind

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• Lean.Elab.instInhabitedRecKind = { default := Lean.Elab.RecKind.partial }

inductive Lean.Elab.ComputeKind : Type

Codegen-relevant modifiers.

• regular : ComputeKind
• meta : ComputeKind
• noncomputable : ComputeKind

instance Lean.Elab.instInhabitedComputeKind : Inhabited ComputeKind

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• Lean.Elab.instInhabitedComputeKind = { default := Lean.Elab.ComputeKind.regular }

structure Lean.Elab.Modifiers : Type

Flags and data added to declarations (eg docstrings, attributes, private, unsafe, partial, ...).

• stx : TSyntax `Lean.Parser.Command.declModifiers

  Input syntax, used for adjusting declaration range (unless missing)

• docString? : Option (TSyntax `Lean.Parser.Command.docComment)
• visibility : Visibility
• isProtected : Bool
• computeKind : ComputeKind
• recKind : RecKind
• isUnsafe : Bool
• attrs : Array Attribute

instance Lean.Elab.instInhabitedModifiers : Inhabited Modifiers

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def Lean.Elab.Modifiers.isPrivate (m : Modifiers) : Bool

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• m.isPrivate = m.visibility.isPrivate

def Lean.Elab.Modifiers.isPublic (m : Modifiers) : Bool

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• m.isPublic = m.visibility.isPublic

def Lean.Elab.Modifiers.isInferredPublic (env : Environment) (m : Modifiers) : Bool

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• Lean.Elab.Modifiers.isInferredPublic env m = Lean.Elab.Visibility.isInferredPublic env m.visibility

def Lean.Elab.Modifiers.isPartial : Modifiers → Bool

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• x✝.isPartial = false

def Lean.Elab.Modifiers.isInferredPartial : Modifiers → Bool

Whether the declaration is explicitly partial or should be considered as such via meta. In the latter case, elaborators should not produce an error if partiality is unnecessary.

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• x✝.isInferredPartial = false

def Lean.Elab.Modifiers.isNonrec : Modifiers → Bool

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• x✝.isNonrec = false

def Lean.Elab.Modifiers.isMeta (m : Modifiers) : Bool

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• m.isMeta = match m.computeKind with | Lean.Elab.ComputeKind.meta => true | x => false

def Lean.Elab.Modifiers.isNoncomputable (m : Modifiers) : Bool

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• m.isNoncomputable = match m.computeKind with | Lean.Elab.ComputeKind.noncomputable => true | x => false

def Lean.Elab.Modifiers.addAttr (modifiers : Modifiers) (attr : Attribute) : Modifiers

Adds attribute attr in modifiers

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def Lean.Elab.Modifiers.addFirstAttr (modifiers : Modifiers) (attr : Attribute) : Modifiers

Adds attribute attr in modifiers, at the beginning

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def Lean.Elab.Modifiers.filterAttrs (modifiers : Modifiers) (p : Attribute → Bool) : Modifiers

Filters attributes using p

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instance Lean.Elab.instToFormatModifiers : ToFormat Modifiers

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instance Lean.Elab.instToStringModifiers : ToString Modifiers

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• Lean.Elab.instToStringModifiers = { toString := toString ∘ Std.format }

def Lean.Elab.expandOptDocComment? {m : Type → Type} [Monad m] [MonadError m] (optDocComment : Syntax) : m (Option String)

Retrieve doc string from stx of the form (docComment)?.

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def Lean.Elab.elabModifiers {m : Type → Type} [Monad m] [MonadEnv m] [MonadResolveName m] [MonadError m] [MonadMacroAdapter m] [MonadRecDepth m] [MonadTrace m] [MonadOptions m] [AddMessageContext m] [MonadLog m] [MonadLiftT IO m] (stx : TSyntax `Lean.Parser.Command.declModifiers) : m Modifiers

Elaborate declaration modifiers (i.e., attributes, partial, private, protected, unsafe, meta, noncomputable, doc string)

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def Lean.Elab.applyVisibility {m : Type → Type} [Monad m] [MonadEnv m] [MonadError m] [MonadFinally m] [MonadInfoTree m] (modifiers : Modifiers) (declName : Name) : m Name

Ensure the function has not already been declared, and apply the given visibility setting to declName. If private, return the updated name using our internal encoding for private names. If protected, register declName as protected in the environment.

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def Lean.Elab.checkIfShadowingStructureField {m : Type → Type} [Monad m] [MonadEnv m] [MonadError m] (declName : Name) : m Unit

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• Lean.Elab.checkIfShadowingStructureField declName = pure ()

def Lean.Elab.mkDeclName {m : Type → Type} [Monad m] [MonadEnv m] [MonadError m] [MonadFinally m] [MonadInfoTree m] (currNamespace : Name) (modifiers : Modifiers) (shortName : Name) : m (Name × Name)

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def Lean.Elab.expandDeclIdCore (declId : Syntax) : Name × Syntax

declId is of the form

leading_parser ident >> optional (".{" >> sepBy1 ident ", " >> "}")

but we also accept a single identifier to users to make macro writing more convenient .

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structure Lean.Elab.ExpandDeclIdResult : Type

expandDeclId resulting type.

• shortName : Name

  Short name for recursively referring to the declaration.

• declName : Name

  Fully qualified name that will be used to name the declaration in the kernel.

• levelNames : List Name

  Universe parameter names provided using the universe command and .{...} notation.

def Lean.Elab.expandDeclId {m : Type → Type} [Monad m] [MonadEnv m] [MonadError m] [MonadFinally m] [MonadOptions m] [AddMessageContext m] [MonadLog m] [MonadInfoTree m] [MonadLiftT IO m] (currNamespace : Name) (currLevelNames : List Name) (declId : Syntax) (modifiers : Modifiers) : m ExpandDeclIdResult

Given a declaration identifier (e.g., ident (".{" ident,+ "}")?) that may contain explicit universe parameters

• Ensure the new universe parameters do not shadow universe parameters declared using universe command.
• Create the fully qualified named for the declaration using the current namespace, and given modifiers
• Create a short version for recursively referring to the declaration. Recall that the protected modifier affects the generation of the short name.

The result also contains the universe parameters provided using universe command, and the .{...} notation.

This commands also stores the doc string stored in modifiers.

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