From 318137e9cc2595c2b994c1bb2ae8268d734e8f28 Mon Sep 17 00:00:00 2001
From: ko1 <ko1@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Thu, 22 Jun 2017 05:51:43 +0000
Subject: catch up frozen_string_literal: true.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59139 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 test/lib/test/unit/assertions.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/test/lib/test/unit/assertions.rb b/test/lib/test/unit/assertions.rb
index e0ac732fcd..45a64e3bd1 100644
--- a/test/lib/test/unit/assertions.rb
+++ b/test/lib/test/unit/assertions.rb
@@ -541,7 +541,7 @@ EOT
             sigdesc = "SIG#{signame} (#{sigdesc})"
           end
           if status.coredump?
-            sigdesc << " (core dumped)"
+            sigdesc = "#{sigdesc} (core dumped)"
           end
           full_message = ''.dup
           message = message.call if Proc === message
-- 
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