[Bug c++/77595] concepts: constrained member functions illegally instantiated during explicit class template instantiation

[akrzemi1 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77595

--- Comment #1 from Andrzej Krzemienski <akrzemi1 at gmail dot com> ---
I mean, the expectation is that member functions whose constraints are not
satisfied should be omitted during explicit class template instantiation.

See this discussion for more background:
https://groups.google.com/a/isocpp.org/forum/?fromgroups#!topic/concepts/EZZjh_kFiJY