https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91073
--- Comment #11 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Paolo Carlini <pa...@gcc.gnu.org>: https://gcc.gnu.org/g:83fe2b921830c177e3dee514aa07cbc7c8ceef1c commit r10-5990-g83fe2b921830c177e3dee514aa07cbc7c8ceef1c Author: Paolo Carlini <paolo.carl...@oracle.com> Date: Wed Jan 15 22:28:46 2020 +0100 Fix "PR c++/91073 if constexpr no longer works directly with Concepts." This is a rather serious regression, filed in July 2019. Luckily the fix is simple: is localized to parser.c and cp-tree.h in cp and boils down to only a few lines. Testing OK on x86_64-linux. Approved off-line by Jason Merrill. /cp PR c++/91073 * cp-tree.h (is_constrained_auto): New. * parser.c (cp_parser_maybe_commit_to_declaration): Correctly handle concept-check expressions; take a cp_decl_specifier_seq* instead of a bool. (cp_parser_condition): Update call. (cp_parser_simple_declaration): Likewise. (cp_parser_placeholder_type_specifier): Correctly handle concept-check expressions. /testsuite PR c++/91073 * g++.dg/concepts/pr91073-1.C: New. * g++.dg/concepts/pr91073-2.C: Likewise.
