def Lean.Meta.forallTelescopeCompatibleAux {α : Type} (k : Array Lean.Expr → Lean.Expr → Lean.Expr → Lean.MetaM α) : Nat → Lean.Expr → Lean.Expr → Array Lean.Expr → Lean.MetaM α

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• Lean.Meta.forallTelescopeCompatibleAux k 0 x✝¹ x✝ x = k x x✝¹ x✝

def Lean.Meta.forallTelescopeCompatible {α : Type} {m : Type → Type u_1} [Monad m] [MonadControlT Lean.MetaM m] (type₁ : Lean.Expr) (type₂ : Lean.Expr) (numParams : Nat) (k : Array Lean.Expr → Lean.Expr → Lean.Expr → m α) : m α

Given two forall-expressions type₁ and type₂, ensure the first numParams parameters are compatible, and then execute k with the parameters and remaining types.

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def Lean.Elab.expandOptDeclSig (stx : Lean.Syntax) : Lean.Syntax × Option Lean.Syntax

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def Lean.Elab.expandDeclSig (stx : Lean.Syntax) : Lean.Syntax × Lean.Syntax

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• Lean.Elab.expandDeclSig stx = let binders := stx[0]; let typeSpec := stx[1]; (binders, typeSpec[1])

def Lean.Elab.mkFreshInstanceName (env : Lean.Environment) (nextIdx : Nat) : Lake.Name

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• Lean.Elab.mkFreshInstanceName env nextIdx = Lean.Name.appendIndexAfter (Lean.Environment.mainModule env ++ `_instance) nextIdx

def Lean.Elab.isFreshInstanceName (name : Lake.Name) : Bool

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• Lean.Elab.isFreshInstanceName name = match name with | Lean.Name.str pre s => String.isPrefixOf "_instance" s | x => false

def Lean.Elab.sortDeclLevelParams (scopeParams : List Lake.Name) (allUserParams : List Lake.Name) (usedParams : Array Lake.Name) : Except String (List Lake.Name)

Sort the given list of usedParams using the following order:

• If it is an explicit level allUserParams, then use user given order.
• Otherwise, use lexicographical.

Remark: scopeParams are the universe params introduced using the universe command. allUserParams contains the universe params introduced using the universe command and the .{...} notation.

Remark: this function return an exception if there is an u not in usedParams, that is in allUserParams but not in scopeParams.

Remark: explicitParams are in reverse declaration order. That is, the head is the last declared parameter.

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