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+Require Import Setoid.
+Axiom P : nat -> Prop.
+Axiom P_or : forall x y, P (x + y) <-> P x \/ P y.
+Lemma foo (H : P 3) : False.
+eapply or_introl in H.
+erewrite <- P_or in H.
+(* Error: No such hypothesis: H *)