From 9cd118ca3d3e9882e4ecb14b153aa05cb070b453 Mon Sep 17 00:00:00 2001
From: Mark Jaquith <mark.github@txfx.net>
Date: Fri, 25 Oct 2013 16:28:15 -0400
Subject: [PATCH 1/2] Add a unit test for issue-126

Add a unit test to test to test for aggressive parenthesis removal that causes functional changes.
---
 test/compress/issue-126.js | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/test/compress/issue-126.js b/test/compress/issue-126.js
index 1e654941..7a597b87 100644
--- a/test/compress/issue-126.js
+++ b/test/compress/issue-126.js
@@ -10,6 +10,7 @@ concatenate_rhs_strings: {
         foo(bar() + 123 + "Hello" + "World" + ("Foo" + "Bar"));
         foo("Foo" + "Bar" + bar() + 123 + "Hello" + "World" + ("Foo" + "Bar"));
         foo("Hello" + bar() + 123 + "World");
+        foo(bar() + 'Foo' + (10 + parseInt('10')));
     }
     expect: {
         foo(bar() + 123 + "HelloWorld");
@@ -18,5 +19,6 @@ concatenate_rhs_strings: {
         foo(bar() + 123 + "HelloWorldFooBar");
         foo("FooBar" + bar() + "123HelloWorldFooBar");
         foo("Hello" + bar() + "123World");
+        foo(bar() + 'Foo' + (10 + parseInt('10')));
     }
 }

From e2daee9a655160e4eeea6dee4ceddfe0049ebacf Mon Sep 17 00:00:00 2001
From: Richard van Velzen <rvanvelzen1@gmail.com>
Date: Sat, 26 Oct 2013 18:44:52 +0200
Subject: [PATCH 2/2] Fix RHS concat (raised in #330)

When attempting to concat the left-side of the rhs, make sure the rhs is
a string.
---
 lib/compress.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/compress.js b/lib/compress.js
index 121e312a..13ae7c70 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -2067,7 +2067,8 @@ merge(Compressor.prototype, {
                     && self.left.right instanceof AST_Constant
                     && self.right instanceof AST_Binary
                     && self.right.operator == "+"
-                    && self.right.left instanceof AST_Constant) {
+                    && self.right.left instanceof AST_Constant
+                    && self.right.is_string(compressor)) {
                     self = make_node(AST_Binary, self, {
                         operator: "+",
                         left: make_node(AST_Binary, self.left, {