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

[alisdairm at me dot com]

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

--- Comment #1 from Alisdair Meredith <alisdairm at me dot com> ---
Sorry, link to Compiler Explorer showing the right compiler test (Clang 9):
   https://godbolt.org/z/9QIIrE