https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70468
--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> --- clang++ errors here are on #c0: pr70468.C:6:10: error: type 'A::f0' (aka 'A<>') is not a direct or virtual base of 'A<type-parameter-0-0>' and on #c2: pr70468-2.C:5:10: error: type 'A::f0' (aka 'A<>') is not a direct or virtual base of 'A<type-parameter-0-0>'