git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_3@62855 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
r62810. ruby_2_3 does not output "[IMPORTANT]" message.
see [Backport #13566]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_3@62855 b2dd03c8-39d4-4d8f-98ff-823fe69b080e