[Bug c++/66686] Instantiation of dependent template template parameter with non-dependent template rejected

[msebor at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66686

--- Comment #6 from Martin Sebor <msebor at gcc dot gnu.org> ---
The misunderstanding was mine -- I had forgotten that a template template can
be instantiated on a template without providing or deducing the arguments for
the latter.  Please disregard my comment #4.