https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110065
--- Comment #5 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The trunk branch has been updated by Marek Polacek <mpola...@gcc.gnu.org>: https://gcc.gnu.org/g:a3054489117085c095e480c71b6aaeea9a463c37 commit r14-7264-ga3054489117085c095e480c71b6aaeea9a463c37 Author: Marek Polacek <pola...@redhat.com> Date: Mon Jan 15 09:15:59 2024 -0500 c++: ICE with auto in template arg [PR110065] Here we started crashing with r14-1659 because that removed the auto checking in cp_parser_template_type_arg which seemed like dead code. But the attached test shows that the code can still be reached because cp_parser_type_id_1 checks auto only when auto_is_implicit_function_template_parm_p is on. Then I noticed that we're still crashing in C++20, and that ICE started with r12-4772. So I changed the reemerged check to use flag_concepts_ts rather than flag_concepts on the basis that check_auto_in_tmpl_args also checks flag_concepts_ts. PR c++/110065 gcc/cp/ChangeLog: * parser.cc (cp_parser_template_type_arg): Add auto checking. gcc/testsuite/ChangeLog: * g++.dg/concepts/auto8.C: New test. * g++.dg/concepts/auto8a.C: New test.
