[Bug c++/66988] [concepts] concept with template template parameter satisfied erroneously

[andrew.n.sutton at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66988

--- Comment #1 from Andrew Sutton <andrew.n.sutton at gmail dot com> ---
I don't know if that's strictly a concepts issue. My guess is that the template
argument coersion of this argument:

   template <typename> class

to this parameter:

   template <typename...> class

is not succeeding.