structure Lean.Elab.Term.MkInstResult : Type

Result for mkInst?

• instVal : Lean.Expr
• instType : Lean.Expr
• outParams : Array Lean.Expr

def Lean.Elab.Term.processDefDeriving (className : Lean.Name) (declName : Lean.Name) : Lean.Elab.TermElabM Bool

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def Lean.Elab.DerivingHandler : Type

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• Lean.Elab.DerivingHandler = (Array Lean.Name → Lean.Elab.Command.CommandElabM Bool)

@[deprecated Lean.Elab.DerivingHandler]

def Lean.Elab.DerivingHandlerNoArgs : Type

Deprecated - DerivingHandler no longer assumes arguments

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• Lean.Elab.DerivingHandlerNoArgs = (Array Lean.Name → Lean.Elab.Command.CommandElabM Bool)

opaque Lean.Elab.derivingHandlersRef : IO.Ref (Lean.NameMap (List Lean.Elab.DerivingHandler))

def Lean.Elab.registerDerivingHandler (className : Lean.Name) (handler : Lean.Elab.DerivingHandler) : IO Unit

A DerivingHandler is called on the fully qualified names of all types it is running for as well as the syntax of a with argument, if present.

For example, deriving instance Foo with fooArgs for Bar, Baz invokes fooHandler #[`Bar, `Baz] `(fooArgs).

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def Lean.Elab.defaultHandler (className : Lean.Name) (typeNames : Array Lean.Name) : Lean.Elab.Command.CommandElabM Unit

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def Lean.Elab.applyDerivingHandlers (className : Lean.Name) (typeNames : Array Lean.Name) : Lean.Elab.Command.CommandElabM Unit

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def Lean.Elab.elabDeriving : Lean.Elab.Command.CommandElab

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structure Lean.Elab.DerivingClassView : Type

• ref : Lean.Syntax
• className : Lean.Name

def Lean.Elab.getOptDerivingClasses (optDeriving : Lean.Syntax) : Lean.CoreM (Array Lean.Elab.DerivingClassView)

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def Lean.Elab.DerivingClassView.applyHandlers (view : Lean.Elab.DerivingClassView) (declNames : Array Lean.Name) : Lean.Elab.Command.CommandElabM Unit

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• view.applyHandlers declNames = Lean.withRef view.ref (Lean.Elab.applyDerivingHandlers view.className declNames)