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(* (c) Copyright 2006-2015 Microsoft Corporation and Inria. *)
(* Distributed under the terms of CeCILL-B. *)
Require Import mathcomp.ssreflect.ssreflect.
From mathcomp
Require Import ssrbool.
Lemma test b : b || ~~b.
wlog _ : b / b = true.
case: b; [ by apply | by rewrite orbC ].
wlog suff: b / b || ~~b.
by case: b.
by case: b.
Qed.
Lemma test2 b c (H : c = b) : b || ~~b.
wlog _ : b {c H} / b = true.
by case: b H.
by case: b.
Qed.
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