[Bug c++/119034] Nested using-declaration doesn't do ADL or uses wrong associated namespace

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119034

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #0)
> If the helper classes are written like this then all compilers are happy:

Actually that's not true, MSVC is still unhappy. I think the adl_func concept
is not satisfied.