merge revision(s) 66888: [Backport #15460]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_6@66952 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merge revision(s) 66888: [Backport #15460]
Merge CRuby r66824
With fixing actual spec and the version the change applied.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_6@66952 b2dd03c8-39d4-4d8f-98ff-823fe69b080e