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(************************************************************************)
(* v * The Coq Proof Assistant / The Coq Development Team *)
(* <O___,, * CNRS-Ecole Polytechnique-INRIA Futurs-Universite Paris Sud *)
(* \VV/ **************************************************************)
(* // * This file is distributed under the terms of the *)
(* * GNU Lesser General Public License Version 2.1 *)
(************************************************************************)
(* Initialization code for typeclasses, setting up the default tactic
for instance search.
Author: Matthieu Sozeau
Institution: LRI, CNRS UMR 8623 - UniversitÃcopyright Paris Sud
91405 Orsay, France *)
(* $Id: Init.v 12187 2009-06-13 19:36:59Z msozeau $ *)
(** Hints for the proof search: these combinators should be considered rigid. *)
Require Import Coq.Program.Basics.
Typeclasses Opaque id const flip compose arrow impl iff.
(** The unconvertible typeclass, to test that two objects of the same type are
actually different. *)
Class Unconvertible (A : Type) (a b : A) := unconvertible : unit.
Ltac unconvertible :=
match goal with
| |- @Unconvertible _ ?x ?y => unify x y with typeclass_instances ; fail 1 "Convertible"
| |- _ => exact tt
end.
Hint Extern 0 (@Unconvertible _ _ _) => unconvertible : typeclass_instances.
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