[Bug c++/70141] [6.0 regression] template parameter not deducible in partial specialization of template inside template

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70141

--- Comment #9 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
There is really no need to take another look.
When your testcase generates a warning under clang and also gets rejected by
MSVC, it is obvious that there is something wrong with it.