nobu	2017-07-17 00:28:50 +0900 (Mon, 17 Jul 2017)

  New Revision: 59346

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=59346

  Log:
    assertions.rb: frozen string buffer
    
    * test/lib/test/unit/assertions.rb (assert_pattern_list): make
      frozen string literals modifiable as buffers.

  Modified files:
    trunk/test/lib/test/unit/assertions.rb
Index: test/lib/test/unit/assertions.rb
===================================================================
--- test/lib/test/unit/assertions.rb	(revision 59345)
+++ test/lib/test/unit/assertions.rb	(revision 59346)
@@ -781,13 +781,13 @@ eom https://github.com/ruby/ruby/blob/trunk/test/lib/test/unit/assertions.rb#L781
               msg = message(msg) {
                 expect_msg = "Expected #{mu_pp pattern}\n"
                 if /\n[^\n]/ =~ rest
-                  actual_mesg = "to match\n"
+                  actual_mesg = +"to match\n"
                   rest.scan(/.*\n+/) {
                     actual_mesg << '  ' << $&.inspect << "+\n"
                   }
                   actual_mesg.sub!(/\+\n\z/, '')
                 else
-                  actual_mesg = "to match #{mu_pp rest}"
+                  actual_mesg = "to match " + mu_pp(rest)
                 end
                 actual_mesg << "\nafter #{i} patterns with #{actual.length - rest.length} characters"
                 expect_msg + actual_mesg

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