Nouveau fichier Tactics.v collectant les tactiques utiles des utilisateurs

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@6666 85f007b7-540e-0410-9357-904b9bb8a0f7

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diff --git a/theories/Init/Tactics.v b/theories/Init/Tactics.v
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+(************************************************************************)
+(*  v      *   The Coq Proof Assistant  /  The Coq Development Team     *)
+(* <O___,, * CNRS-Ecole Polytechnique-INRIA Futurs-Universite Paris Sud *)
+(*   \VV/  **************************************************************)
+(*    //   *      This file is distributed under the terms of the       *)
+(*         *       GNU Lesser General Public License Version 2.1        *)
+(************************************************************************)
+
+(*i $Id$ i*)
+
+Require Import Notations.
+Require Import Logic.
+
+(** Useful tactics *)
+
+Ltac rewrite_all Eq := match type of Eq with
+  ?a = ?b =>
+     generalize Eq; clear Eq;
+     match goal with
+    | H : context [a] |- _ => intro Eq; rewrite Eq in H; rewrite_all Eq
+    | _ => intro Eq
+    end
+ end.