parse.y: fail if invalid name
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@40607 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
parse.y: fail if invalid name
name character. [ruby-core:54846] [Bug #8375].
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@40607 b2dd03c8-39d4-4d8f-98ff-823fe69b080e