git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_2@29914 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merges r29280 from trunk into ruby_1_9_2 and adds a minimal regression
test.
ignoring custom_require. [ruby-core:31858]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_2@29914 b2dd03c8-39d4-4d8f-98ff-823fe69b080e