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* defs/id.def (predefined): add idLASTLINE and idBACKREF for $~ and $_ respectively. * parse.y: use idLASTLINE and idBACKREF instead of rb_intern. git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53856 b2dd03c8-39d4-4d8f-98ff-823fe69b080e