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 67f7414..6bfa0a6 100644 (file)
--- a/engine/pattern_c.ml
+++ b/engine/pattern_c.ml
@@ -147,7 +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 ->