[Bug c++/71128] [concepts] ICE on ill-formed explicit instantiation of a function concept

[paolo.carlini at oracle dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71128

--- Comment #4 from Paolo Carlini <paolo.carlini at oracle dot com> ---
*** Bug 71129 has been marked as a duplicate of this bug. ***