https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98885
--- Comment #5 from Nathan Sidwell <nathan at gcc dot gnu.org> --- your A-impl.cpp needs `import :B` and vice-versa
nathan at gcc dot gnu.org via Gcc-bugs Fri, 29 Jan 2021 07:58:08 -0800
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98885
--- Comment #5 from Nathan Sidwell <nathan at gcc dot gnu.org> --- your A-impl.cpp needs `import :B` and vice-versa