git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_3@37173 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
after raw hyphen in regexp class, because the charcter code area
is union'ed with the property of TK_CHAR_TYPE.
reported by Bushi Zhang at [ruby-core:47115] [Backport #6853].
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_3@37173 b2dd03c8-39d4-4d8f-98ff-823fe69b080e