MSVC support?

[nickdademo]

First of all, great work! :)

Docs mention only Clang and GCC as supported of course.

Nevertheless, tried my luck and gave it a go with MSVC (VS 17.11.5) - doesn't seem to like the following block (syntax error):

        template <class B, class T> struct bind
        {
            friend constexpr auto get(B)
            {
                return provider<T>{};
            }
        };

Any ideas? Is MSVC missing some C++20 language feature to use this header? MSVC seems to be mostly green for C++20 in https://en.cppreference.com/w/cpp/compiler_support#cpp20