https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83077
--- Comment #18 from Iain Sandoe <iains at gcc dot gnu.org> --- for changes to libstdc++ or the FE I usually run "make check-c++" which does the library (plus the libgomp and itm deps) and the FE. My guess is that the FE is referencing something that needs to have an inline namespace added. There are also some failing coroutine tests (because their scan strings need to account for the inline namespace - I have a WIP patch for that, it's just tedious editing of pattern matches).
