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+(* Wish #2154 by E. van der Weegen *)
+
+(* auto was not using f_equal-style lemmas with metavariables occuring
+   only in the type of an evar of the concl, but not directly in the
+   concl itself *)
+
+Parameters
+  (F: Prop -> Prop)
+  (G: forall T, (T -> Prop) -> Type)
+  (L: forall A (P: A -> Prop), G A P -> forall x, F (P x))
+  (Q: unit -> Prop).
+
+Hint Resolve L.
+
+Goal G unit Q -> F (Q tt).
+  intro.
+  auto.
+Qed.
+
+(* Test implicit arguments in "using" clause *)
+
+Goal forall n:nat, nat * nat.
+auto using (pair O).
+Undo.
+eauto using (pair O).
+Qed.