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(************************************************************************)
(* * The Coq Proof Assistant / The Coq Development Team *)
(* v * Copyright INRIA, CNRS and contributors *)
(* <O___,, * (see version control and CREDITS file for authors & dates) *)
(* \VV/ **************************************************************)
(* // * This file is distributed under the terms of the *)
(* * GNU Lesser General Public License Version 2.1 *)
(* * (see LICENSE file for the text of the license) *)
(************************************************************************)
(* (c) Copyright 2006-2016 Microsoft Corporation and Inria. *)
Require Import ssreflect.
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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