From 9a16f9bec7db3155021ec48e66157934a9eb65b8 Mon Sep 17 00:00:00 2001
From: Ralf Jung <jung@mpi-sws.org>
Date: Wed, 24 Feb 2016 14:24:48 +0100
Subject: [PATCH] make find_pat more robust: work with idtac

---
 theories/tactics.v | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/theories/tactics.v b/theories/tactics.v
index 5b68110b..c431b468 100644
--- a/theories/tactics.v
+++ b/theories/tactics.v
@@ -303,7 +303,8 @@ Tactic Notation "feed" "destruct" constr(H) "as" simple_intropattern(IP) :=
 It will search for the first subterm of the goal matching [pat], and then call [tac]
 with that subterm. *)
 Ltac find_pat pat tac :=
-  match goal with |- context [?x] => unify pat x; tac x || fail 2
+  match goal with |- context [?x] =>
+                  unify pat x; tryif tac x then idtac else fail 2
 end.
 
 (** Coq's [firstorder] tactic fails or loops on rather small goals already. In 
-- 
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