[Bug c++/96645] [9/10/11/12 Regression] [CWG2335] std::variant default constructor and unparsed DMI

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96645

--- Comment #16 from Jason Merrill <jason at gcc dot gnu.org> ---
A more targeted possiblity would be for __is_constructible to error if the
class has unparsed DMI.