[Bug libstdc++/120088] Use of uninitialized value in constant expression when copy-constructing a std::expected from another copy-assigned non-erroneous std::expected

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120088

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Jiang An from comment #2)
 > The divergence is probably due to that Clang and EDG haven't implemented
> CWG2658
> (https://cplusplus.github.io/CWG/issues/2658.html).

Yes, that would explain it, thanks.