[Bug c++/120306] Copy constructor with requires (!std::copy_constructible) is available

[rguenth at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120306

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |accepts-invalid

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
So clang says

error: incomplete type 'S<int>' used in type trait expression

is that a required diagnostic or is it one of the "no diagnostic required"
cases?