Support empty lists with new parser.
Remove old yacc file.
Try with lexing & parsing returning explicit errors.
Explicit errors will not make it easy to have multiple errors.

Revert "Try with lexing & parsing returning explicit errors."

This reverts commit ff268f57b08a8dad8277126b959652d81b364334.
Explicit EOF token.
Generating errors when there's no/invalid closing parenthesis.
Invalid tokens position - no panic'ing.
Parsing can return errors