https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99850
--- Comment #6 from CVS 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:784de5292c34e287c848b382b431599b818ea76e commit r11-8210-g784de5292c34e287c848b382b431599b818ea76e Author: Jakub Jelinek <ja...@redhat.com> Date: Fri Apr 16 09:34:26 2021 +0200 c++: Fix up C++23 [] <...> requires primary -> type {} parsing [PR99850] The requires clause parsing has code to suggest users wrapping non-primary expressions in (), so if it e.g. parses a primary expression and sees it is followed by ++, --, ., ( or -> among other things it will try to reparse it as assignment expression or what and if that works suggests wrapping it inside of parens. When it is requires-clause that is after <typename T> etc. it already has an exception from that as ( can occur in valid C++20 expression there - starting the parameters of the lambda. In C++23 another case can occur, as the parameters with the ()s can be omitted, requires C can be followed immediately by -> which starts a trailing return type. Even in that case, we don't want to parse that as C->... 2021-04-16 Jakub Jelinek <ja...@redhat.com> PR c++/99850 * parser.c (cp_parser_constraint_requires_parens) <case CPP_DEREF>: If lambda_p, return pce_ok instead of pce_maybe_postfix. * g++.dg/cpp23/lambda-specifiers2.C: New test.
