test/ruby/test_thread.rb: add diagnosis code for [Bug #15430]
I can't find stderr in the test-all output of the CI machine, so maybe the assertion will show what's going on.
http://rubyci.s3.amazonaws.com/centos7/ruby-trunk/log/20181221T170003Z.log.html.gz#test-all
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@66487 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
test/ruby/test_thread.rb: add diagnosis code for [Bug #15430]
I can't find stderr in the test-all output of the CI machine,
so maybe the assertion will show what's going on.
http://rubyci.s3.amazonaws.com/centos7/ruby-trunk/log/20181221T170003Z.log.html.gz#test-all
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@66487 b2dd03c8-39d4-4d8f-98ff-823fe69b080e