/-
Copyright (c) 2020 Microsoft Corporation. All rights reserved.
Released under Apache 2.0 license as described in the file LICENSE.
Authors: Leonardo de Moura
-/
import Lean.Meta.ExprDefEq

/- Helper methods for inductive datatypes -/

namespace Lean.Meta

/- Return true if the types of the given constructors are compatible. -/
def compatibleCtors (ctorName₁ ctorName₂ : Name) : MetaM Bool := do
  let ctorInfo₁ ← getConstInfoCtor ctorName₁
  let ctorInfo₂ ← getConstInfoCtor ctorName₂
  if ctorInfo₁.induct != ctorInfo₂.induct then
    return false
  else
    let (_, _, ctorType₁) ← forallMetaTelescope ctorInfo₁.type
    let (_, _, ctorType₂) ← forallMetaTelescope ctorInfo₂.type
    isDefEq ctorType₁ ctorType₂

end Lean.Meta