[Bug c++/92034] extern template declarations cannot have internal linkage (unnamed namespace)

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92034

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2019-10-09
     Ever confirmed|0                           |1

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I'm not sure if a diagnostic is required. The standard doesn't specifically say
it's ill-formed to do this. By my reading it's undefined, and so silently
accepting it is a conforming (but unhelpful) implementation.

Confirming as a diagnostic enhancement at least (and maybe accepts-invalid if
it's supposed to require a diagnostic).