from terminate_spec.rb, as suggested here:
c7220bd3de (commitcomment-31068714)
to guard other inclusions.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@65392 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* Other ruby implementations use the spec/ruby directory.
[Misc #13792] [ruby-core:82287]
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