parse.y: refine error message
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56947 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
parse.y: refine error message
in unicode escape, "invalid" instead of "unterminated".
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56947 b2dd03c8-39d4-4d8f-98ff-823fe69b080e