Release coccinelle-0.2.0

[bpt/coccinelle.git] / engine / pattern_c.ml

diff --git a/engine/pattern_c.ml b/engine/pattern_c.ml
index 99eba15..6bfa0a6 100644 (file)
--- a/engine/pattern_c.ml
+++ b/engine/pattern_c.ml
@@ -1,3 +1,25 @@
+(*
+ * Copyright 2005-2009, Ecole des Mines de Nantes, University of Copenhagen
+ * Yoann Padioleau, Julia Lawall, Rene Rydhof Hansen, Henrik Stuart, Gilles Muller, Nicolas Palix
+ * This file is part of Coccinelle.
+ *
+ * Coccinelle is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, according to version 2 of the License.
+ *
+ * Coccinelle is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Coccinelle.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * The authors reserve the right to distribute this or future versions of
+ * Coccinelle under other licenses.
+ *)
+
+
 (* Yoann Padioleau
  *
  * Copyright (C) 2006, 2007 Ecole des Mines de Nantes
@@ -125,7 +147,9 @@ module XMATCH = struct
       else xs
 *)
     (* opti? use set instead of list *)
-    m1 tin ++ m2 tin
+    let l1 = m1 tin in
+    let l2 = m2 tin in
+    if l2 = [] then l1 else l1 ++ l2 (*a small benefit; avoid a trivial @*)
 
 
   let return res = fun tin ->