[Bug c++/91418] Nested class of templated class cannot declare parent class friend

[harald at gigawatt dot nl]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91418

--- Comment #5 from Harald van Dijk <harald at gigawatt dot nl> ---
(In reply to Darrell Wright from comment #4)
> The weird part is, other than compilers don't agree, but the lookup finds it
> if you put the template argument in

The idea there seems to be that `class A;` declares a local or nested class,
but `A;`, `class A<T>;`, `class ::A;` do not, and `friend` does not change
that.

This is not something I can find support for in the standard though.