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+(* Testing 8.5 regression with type classes not solving evars 
+   redefined while trying to solve them with the type class mechanism *)
+
+Class A := {}.
+Axiom foo : forall {ac : A}, bool.
+Lemma bar (ac : A) : True.
+Check (match foo as k return foo = k -> True with
+       | true => _
+       | false => _
+       end eq_refl).