https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113929
--- Comment #2 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Jakub Jelinek <ja...@gcc.gnu.org>: https://gcc.gnu.org/g:5286b0761b5dfac4348d1c5bfdcc162a66f338ee commit r14-9033-g5286b0761b5dfac4348d1c5bfdcc162a66f338ee Author: Jakub Jelinek <ja...@redhat.com> Date: Fri Feb 16 17:42:32 2024 +0100 c++: Diagnose this specifier on template parameters [PR113929] For template parameters, the optional this specifier is in the grammar template-parameter-list -> template-parameter -> parameter-declaration, just [dcl.fct/6] says that it is only valid in parameter-list of certain functions. So, unlike the case of decl-specifier-seq used in non-terminals other than parameter-declaration, I think it is better not to fix this by cp_parser_decl_specifier_seq (parser, - flags | CP_PARSER_FLAGS_PARAMETER, + flags | (template_parameter_p ? 0 + : CP_PARSER_FLAGS_PARAMETER), &decl_specifiers, &declares_class_or_enum); which would be pretending it isn't in the grammar, but by diagnosing it separately, which is what the following patch does. 2024-02-16 Jakub Jelinek <ja...@redhat.com> PR c++/113929 * parser.cc (cp_parser_parameter_declaration): Diagnose this specifier on template parameter declaration. * g++.dg/parse/pr113929.C: New test.
