[Bug c++/72708] error on anonymous union in an unnamed namespace

[the1987.6 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=72708

--- Comment #4 from 高橋将 <the1987.6 at gmail dot com> ---
cppreference.com also says:

"Namespace-scope anonymous unions must be declared static unless they appear in
an unnamed namespace."

on Union declaration.

It would be best if this bug was fixed.