revert r39861
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39864 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
revert r39861
for array variables in extension libraries.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39864 b2dd03c8-39d4-4d8f-98ff-823fe69b080e