akr	2014-11-01 22:29:18 +0900 (Sat, 01 Nov 2014)

  New Revision: 48226

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=48226

  Log:
    refine message of assert_join_threads.

  Modified files:
    trunk/test/ruby/envutil.rb
Index: test/ruby/envutil.rb
===================================================================
--- test/ruby/envutil.rb	(revision 48225)
+++ test/ruby/envutil.rb	(revision 48226)
@@ -533,10 +533,11 @@ eom https://github.com/ruby/ruby/blob/trunk/test/ruby/envutil.rb#L533
           end
         end
         if !errs.empty?
-          msg = errs.map {|t, err|
+          msg = "exceptions on #{errs.length} threads:\n" +
+            errs.map {|t, err|
+            "#{t.inspect}:\n" +
             err.backtrace.map.with_index {|line, i|
               if i == 0
-                "#{t.inspect}:\n" +
                 "#{line}: #{err.message} (#{err.class})"
               else
                 "\tfrom #{line}"

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