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(* Until revision 10221, rewriting in hypotheses of the form
"(fun x => phi(x)) t" with "t" not rewritable used to behave as a
beta-normalization tactic instead of raising the expected message
"nothing to rewrite" *)
Goal forall b, S b = O -> (fun a => 0 = (S a)) b -> True.
intros b H H0.
rewrite H in H0.
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