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+(* Tauto bug initially due to wrong test for binary connective *)
+
+Parameter A B : Type.
+
+Axiom P : A -> B ->  Prop.
+
+Inductive IP (a  : A) (b: B) : Prop :=
+| IP_def : P a b ->   IP a b.
+
+
+Goal forall (a : A) (b : B), IP a b ->  ~ IP a b -> False.
+Proof.
+  intros.
+  tauto.
+Qed.
+
+