[Bug libstdc++/115522] [13/14/15 Regression] std::to_array no longer works for struct which is trivial but not default constructible

[de34 at live dot cn via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115522

Jiang An <de34 at live dot cn> changed:

           What    |Removed                     |Added
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                 CC|                            |de34 at live dot cn

--- Comment #7 from Jiang An <de34 at live dot cn> ---
(In reply to Jonathan Wakely from comment #5)
> Ah, it looks like is_trivial is just wrong for types with a deleted default
> constructor, that's PR 85723
> 
> The std::to_array code _should_ work correctly for this case :-\

I guess we still need to check is_default_constructible_v even after
__is_trivial gets fixed because the default construct may be protected or
private...