ropes: fix useless var warnings

Signed-off-by: Alexandre Terrasa <alexandre@moz-code.org>

diff --git a/lib/standard/ropes.nit b/lib/standard/ropes.nit
index e67c508..8918aa0 100644 (file)
--- a/lib/standard/ropes.nit
+++ b/lib/standard/ropes.nit
@@ -145,7 +145,6 @@ private class Concat
 
        redef fun +(o) do
                var s = o.to_s
-               var mlen = length
                var slen = s.length
                if s isa Concat then
                        return new Concat(self, s)