# Documentation

Lean.Elab.DeclModifiers

def Lean.Elab.checkNotAlreadyDeclared {m : } [inst : ] [inst : ] [inst : ] [inst : ] (declName : Lean.Name) :

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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Declaration visibility modifier. That is, whether a declaration is regular, protected or private.

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Whether a declaration is default, partial or nonrec.

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

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Store attr in modifiers

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def Lean.Elab.expandOptDocComment? {m : } [inst : ] [inst : ] (optDocComment : Lean.Syntax) :
m ()

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

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def Lean.Elab.elabModifiers {m : } [inst : ] [inst : ] [inst : ] [inst : ] [inst : ] [inst : ] [inst : ] [inst : ] [inst : ] [inst : ] [inst : ] [inst : ] (stx : Lean.Syntax) :

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

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def Lean.Elab.applyVisibility {m : } [inst : ] [inst : ] [inst : ] [inst : ] (visibility : Lean.Elab.Visibility) (declName : Lean.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 : } [inst : ] [inst : ] [inst : ] (declName : Lean.Name) :
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def Lean.Elab.mkDeclName {m : } [inst : ] [inst : ] [inst : ] [inst : ] (currNamespace : Lean.Name) (modifiers : Lean.Elab.Modifiers) (shortName : Lean.Name) :
m ()
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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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• Short name for recursively referring to the declaration.

shortName : Lean.Name
• Fully qualified name that will be used to name the declaration in the kernel.

declName : Lean.Name
• Universe parameter names provided using the universe command and .{...} notation.

levelNames :

expandDeclId resulting type.

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def Lean.Elab.expandDeclId {m : } [inst : ] [inst : ] [inst : ] [inst : ] (currNamespace : Lean.Name) (currLevelNames : ) (declId : Lean.Syntax) (modifiers : Lean.Elab.Modifiers) :

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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