naruse	2015-12-16 14:25:46 +0900 (Wed, 16 Dec 2015)

  New Revision: 53142

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=53142

  Log:
    Exception#backtrace may be nil if it is manually created

  Modified files:
    trunk/test/lib/test/unit/parallel.rb
Index: test/lib/test/unit/parallel.rb
===================================================================
--- test/lib/test/unit/parallel.rb	(revision 53141)
+++ test/lib/test/unit/parallel.rb	(revision 53142)
@@ -139,7 +139,7 @@ module Test https://github.com/ruby/ruby/blob/trunk/test/lib/test/unit/parallel.rb#L139
         rescue Errno::EPIPE
         rescue Exception => e
           begin
-            trace = e.backtrace
+            trace = e.backtrace || ['unknown method']
             err = ["#{trace.shift}: #{e.message} (#{e.class})"] + trace.map{|t| t.prepend("\t") }
 
             _report "bye", Marshal.dump(err.join("\n"))

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