https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92008
--- Comment #16 from Jakub Jelinek <jakub at gcc dot gnu.org> --- bison 1.35 doesn't, and that is what has been used last time. Is even %define api.pure full (vs. %pure_parser) supported in much older bison versions? Maybe 1.875 is the oldest people do use in real-world, not sure. Requiring bison 3 or later only is unacceptable right now.
