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-rw-r--r--theories/Classes/Init.v2
1 files changed, 1 insertions, 1 deletions
diff --git a/theories/Classes/Init.v b/theories/Classes/Init.v
index 8b4cac5f4e..7fb48aa433 100644
--- a/theories/Classes/Init.v
+++ b/theories/Classes/Init.v
@@ -33,7 +33,7 @@ Class Unconvertible (A : Type) (a b : A).
Ltac unconvertible :=
match goal with
- | |- @Unconvertible _ ?x ?y => conv x y ; fail 1 "Convertible"
+ | |- @Unconvertible _ ?x ?y => unify x y with typeclass_instances ; fail 1 "Convertible"
| |- _ => eapply Build_Unconvertible
end.