* ParserState:: refactored $history, renamed to $cache, which is now a   general cache array.  methods referring previously to $history now   refer to $cache['history'].
* ParserState:: refactored $history, renamed to $cache, which is now a
  general cache array.  methods referring previously to $history now
  refer to $cache['history'].

oliverheins/PHPSimpleLexYacc