From e04ef562435547e286019fdee46dd0b89b9822df Mon Sep 17 00:00:00 2001
From: Mihai Bazon <mihai.bazon@gmail.com>
Date: Fri, 10 Apr 2015 11:33:29 +0300
Subject: Use the `before` visitor in mangle props

(works around a bug in our tree walker which, while cloning nodes, breaks
references between labeled statements and break/continue labels)
---
 lib/propmangle.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/propmangle.js b/lib/propmangle.js
index f79b4748..46fb7521 100644
--- a/lib/propmangle.js
+++ b/lib/propmangle.js
@@ -102,7 +102,7 @@ function mangle_properties(ast, options) {
     }));
 
     // step 2: transform the tree, renaming properties
-    return ast.transform(new TreeTransformer(null, function(node){
+    return ast.transform(new TreeTransformer(function(node){
         if (node instanceof AST_ObjectKeyVal) {
             if (should_mangle(node.key)) {
                 node.key = mangle(node.key);
-- 
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