From: Richard van Velzen <rvanvelzen1@gmail.com>
Date: Sat, 26 Oct 2013 16:44:52 +0000 (+0200)
Subject: Fix RHS concat (raised in #330)
X-Git-Url: https://git.ndcode.org/public/gitweb.cgi?a=commitdiff_plain;h=e2daee9a655160e4eeea6dee4ceddfe0049ebacf;p=UglifyJS.git

Fix RHS concat (raised in #330)

When attempting to concat the left-side of the rhs, make sure the rhs is
a string.
---

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, {