git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_1@24068 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merges r23959 from trunk into ruby_1_9_1.¶
execute event hooks, with preserving errinfo. [ruby-core:24118]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_1@24068 b2dd03c8-39d4-4d8f-98ff-823fe69b080e