[Bug c++/65152] Several friend function definitions break lookup

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65152

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
So it sounds like the friend declaration injects 'test' into N and thus 'test'
is found but overload resolution fails.  Whether that injection is correct or
not I don't know.  But given you can even define the function there it is
probably what is specified (C++11 11.3/6).

So I think this bug is invalud.