From bd13788fdbe8617eb3a65e98ddb4acc2b5e4f598 Mon Sep 17 00:00:00 2001
From: normal <normal@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Sun, 13 Dec 2015 03:17:28 +0000
Subject: lib/shellwords.rb: do not change API with frozen-string-literal

This fixes a bug introduced in r53066 when attempting to
shellescape an empty string.

* lib/shellwords.rb (shellescape): duplicate frozen literal
* test/test_shellwords.rb (test_stringification): new test

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53068 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 lib/shellwords.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'lib/shellwords.rb')

diff --git a/lib/shellwords.rb b/lib/shellwords.rb
index d02d3b06d5..66092c8999 100644
--- a/lib/shellwords.rb
+++ b/lib/shellwords.rb
@@ -125,7 +125,7 @@ module Shellwords
     str = str.to_s
 
     # An empty argument will be skipped, so return empty quotes.
-    return "''" if str.empty?
+    return "''".dup if str.empty?
 
     str = str.dup
 
-- 
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