diff options
Diffstat (limited to 'theories/Classes/Init.v')
| -rw-r--r-- | theories/Classes/Init.v | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/theories/Classes/Init.v b/theories/Classes/Init.v index 6ba0c61e..e5f951d0 100644 --- a/theories/Classes/Init.v +++ b/theories/Classes/Init.v @@ -13,9 +13,22 @@ Institution: LRI, CNRS UMR 8623 - UniversitĂcopyright Paris Sud 91405 Orsay, France *) -(* $Id: Init.v 10739 2008-04-01 14:45:20Z herbelin $ *) +(* $Id: Init.v 11282 2008-07-28 11:51:53Z msozeau $ *) (* Ltac typeclass_instantiation := typeclasses eauto || eauto. *) Tactic Notation "clapply" ident(c) := eapply @c ; eauto with typeclass_instances. + +(** The unconvertible typeclass, to test that two objects of the same type are + actually different. *) + +Class Unconvertible (A : Type) (a b : A). + +Ltac unconvertible := + match goal with + | |- @Unconvertible _ ?x ?y => conv x y ; fail 1 "Convertible" + | |- _ => apply Build_Unconvertible + end. + +Hint Extern 0 (@Unconvertible _ _ _) => unconvertible : typeclass_instances.
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