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+Inductive myand (P Q : Prop) := myconj : P -> Q -> myand P Q.
+
+Lemma foo P Q R : R = myand P Q -> P -> Q -> R.
+Proof. intros ->; constructor; auto. Qed.
+
+Hint Extern 0 (myand _ _) => eapply foo; [reflexivity| |] : test1.
+
+Goal forall P Q R : Prop, P -> Q -> R -> myand P (myand Q R).
+Proof.
+ intros.
+ eauto with test1.
+Qed.
+
+Hint Extern 0 =>
+ match goal with
+ | |- myand _ _ => eapply foo; [reflexivity| |]
+ end : test2.
+
+Goal forall P Q R : Prop, P -> Q -> R -> myand P (myand Q R).
+Proof.
+ intros.
+ eauto with test2. (* works *)
+Qed.
+