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+(* 1st-order unification did not work when in competition with pattern unif. *)
+
+Set Implicit Arguments.
+Lemma test : forall
+  (A : Type)
+  (B : Type)
+  (f : A -> B)
+  (S : B -> Prop)
+  (EV : forall y (f':A->B), (forall x', S (f' x')) -> S (f y))
+  (HS : forall x', S (f x'))
+  (x : A),
+  S (f x).
+Proof.
+  intros. eapply EV. intros. 
+  (* worked in v8.2 but not in v8.3beta, fixed in r12898 *)
+  apply HS.
+
+  (* still not compatible with 8.2 because an evar can be solved in
+     two different ways and is left open *)