https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100825
TC <rs2740 at gmail dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |rs2740 at gmail dot com --- Comment #7 from TC <rs2740 at gmail dot com> --- I think the code is valid; it's just that the ABI doesn't have a mangling for constraints yet: https://github.com/itanium-cxx-abi/cxx-abi/issues/24