breakage with: [committed] libstdc++: Implement P2909R4 ("Dude, where's my char?") for C++20

[Jonathan Wakely]

On Mon, 8 Jan 2024 at 16:25, Hans-Peter Nilsson wrote:
>
> (Sorry, never a bringer of good news...)

Regarding this bit ... even if you're reporting something I've broken,
I like to see it as an incremental step towards better portability, so
it's always good news ;-)