https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125939
--- Comment #3 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The releases/gcc-16 branch has been updated by Marek Polacek <[email protected]>: https://gcc.gnu.org/g:269a933b80d3b5c716ef1fa83f4f938077dd5da8 commit r16-9165-g269a933b80d3b5c716ef1fa83f4f938077dd5da8 Author: Marek Polacek <[email protected]> Date: Wed Jun 24 13:35:14 2026 -0400 c++/reflection: type traits and reference collapsing [PR125939] This PR shows that some of our meta type traits don't work with references: we emit bogus error: 'const' qualifiers cannot be applied to 'int&' errors. The problem is that build_stub_type is trying to add const to a reference, which you can only do through a typedef, but here we don't have a typedef. Resolved by passing tf_ignore_bad_quals to cp_build_qualified_type. PR c++/125939 gcc/cp/ChangeLog: * method.cc (build_stub_type): Pass tf_ignore_bad_quals to cp_build_qualified_type. gcc/testsuite/ChangeLog: * g++.dg/reflect/type_trait15.C: New test. Reviewed-by: Jason Merrill <[email protected]>
