https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90291
--- Comment #11 from Nathan Sidwell <nathan at gcc dot gnu.org> --- thanks for your input. Richard Smith (Clang maintainer) & I are going to take this question to the evolution group. DR2061 is intended to fix a problem with the original intent of inline namespaces. However, you show an interesting different use case that conflicts.
