Ruby

parse.y: no punctuation instance/class variables

• parse.y (parse_atmark): exclude punctuation follows @ marks,
  whereas it is inclusive after $ mark as some punctuation global
  variables exist.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@67254 b2dd03c8-39d4-4d8f-98ff-823fe69b080e