[Bug c++/61491] An explicit specialization of a member enumeration of a class template is rejected

[paolo.carlini at oracle dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61491

--- Comment #4 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Resolving this requires some additional work beyond what I did back in 2015.
See:

  https://gcc.gnu.org/ml/gcc-patches/2015-07/msg00781.html