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+(* (c) Copyright Microsoft Corporation and Inria. All rights reserved. *)
+Require Import ssreflect 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. \ No newline at end of file