ko1	2017-06-22 14:51:43 +0900 (Thu, 22 Jun 2017)

  New Revision: 59139

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=59139

  Log:
    catch up frozen_string_literal: true.

  Modified files:
    trunk/test/lib/test/unit/assertions.rb
Index: test/lib/test/unit/assertions.rb
===================================================================
--- test/lib/test/unit/assertions.rb	(revision 59138)
+++ test/lib/test/unit/assertions.rb	(revision 59139)
@@ -541,7 +541,7 @@ EOT https://github.com/ruby/ruby/blob/trunk/test/lib/test/unit/assertions.rb#L541
             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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