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(* Test the behaviour of hnf and simpl introduced in revision *)
Variable n:nat.
Definition a:=0.
Eval simpl in (fix plus (n m : nat) {struct n} : nat :=
match n with
| 0 => m
| S p => S (p + m)
end) a a.
Eval hnf in match (plus (S n) O) with S n => n | _ => O end.
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