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Lemma not_true_eq_false : forall (b:bool), b <> true -> b = false.
Proof.
destruct b;intros;trivial.
elim H.
exact (refl_equal true).
Qed.
Section BUG.
Variable b : bool.
Hypothesis H : b <> true.
Hypothesis H0 : b = true.
Hypothesis H1 : b <> true.
Goal False.
rewrite (not_true_eq_false _ H) in * |-.
contradiction.
Qed.
End BUG.
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