From 4f555e2232459eaa4551ddf4e3f7535a416f1ddd Mon Sep 17 00:00:00 2001
From: Mihai Bazon <mihai@bazon.net>
Date: Fri, 23 Nov 2012 10:20:00 +0200
Subject: [PATCH] fix for https://github.com/mishoo/UglifyJS/issues/474

---
 lib/compress.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/compress.js b/lib/compress.js
index 7c4c910d..d78d41d6 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -1744,7 +1744,7 @@ merge(Compressor.prototype, {
         }
         if (self.operator == "+" && self.right instanceof AST_String
             && self.right.getValue() === "" && self.left instanceof AST_Binary
-            && self.left.operator == "+" && self.left.is_string()) {
+            && self.left.operator == "+" && self.left.is_string(compressor)) {
             return self.left;
         }
         return self;
-- 
2.34.1