work done in the parser kernel to support providing a known `$error` value for any `error` grammar production term, where said value is an object carrying the original internally constructed error message and quite a few more info bits to allow your `yyerror()` calls to produce the most readable & unambiguous error reports.
work done in the parser kernel to support providing a known `$error` value for any `error` grammar production term, where said value is an object carrying the original internally constructed error message and quite a few more info bits to allow your `yyerror()` calls to produce the most readable & unambiguous error reports.

GerHobbelt/jison,GerHobbelt/jison,GerHobbelt/jison,GerHobbelt/jison