Partly reverted r59845.
All of environments on Ruby CI are fails rdoc generation. It may be caused by https://github.com/ruby/rdoc/commit/8cfa11d6f1cc7e74e45e42fd8d1d76c5a0646a6e
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59856 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Partly reverted r59845.
All of environments on Ruby CI are fails rdoc generation.
It may be caused by
https://github.com/ruby/rdoc/commit/8cfa11d6f1cc7e74e45e42fd8d1d76c5a0646a6e
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59856 b2dd03c8-39d4-4d8f-98ff-823fe69b080e