From 6eede071cb97e1e39772c2bdecb5189c4fa2adb0 Mon Sep 17 00:00:00 2001
From: Hugo Herbelin
Date: Thu, 21 Jan 2016 23:28:40 +0100
Subject: Extending "contradiction" so that it recognizes statements such as
 "~x=x" or ~True.

Found 1 incompatibility in tested contribs and 3 times the same
pattern of incompatibility in the standard library. In all cases, it
is an improvement in the form of the script.

New behavior deactivated when version is <= 8.5.
---
 CHANGES | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'CHANGES')

diff --git a/CHANGES b/CHANGES
index 594bbc8316..f7e1dee4c7 100644
--- a/CHANGES
+++ b/CHANGES
@@ -61,6 +61,10 @@ Tactics
   "Structural Injection". In this case, hypotheses are also put in the
   context in the natural left-to-right order and the hypothesis on
   which injection applies is cleared.
+- Tactic "contradiction" (hence "easy") now also solve goals with
+  hypotheses of the form "~True" or "t<>t" (possible source of
+  incompatibilities because of more successes in automation, but
+  generally a more intuitive strategy).
 
 Hints
 
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