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(* This used to fail in 8.0pl1 *)
Goal forall n, n+n=0->0=n+n.
intros.
set n in * |-.
Abort.
(* This works from 8.4pl1, since merging of different instances of the
same metavariable in a pattern is done modulo conversion *)
Notation "p .+1" := (S p) (at level 1, left associativity, format "p .+1").
Goal forall (f:forall n, n=0 -> Prop) n (H:(n+n).+1=0), f (n.+1+n) H.
intros.
set (f _ _).
Abort.
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