Ruby » Ruby master

parse.y: fix var_ref of numbered param in ripper

• parse.y (string_dvar, user_variable): register numbered
  parameter in ripper for var_ref.
  [ruby-core:91867] [Bug #15673]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@67306 b2dd03c8-39d4-4d8f-98ff-823fe69b080e