No, it is for compiler writers to mark what is not implemented, instead of doing nothing or using “delete”. See the example I gave upthread.


> On 20 Mar 2025, at 22:49, Sebastian Wittmeier via Std-Proposals <std-proposals_at_[hidden]> wrote:
>
> Or is it for optional features of the standard library? Then the standard library would have to mark its option, but not implemented features as [[unimplemented]].
> But to get rid of the warnings, the cpp file would have to include another header.
> Then the standard library could instead not declare those functions.
> And the other header could declare them.
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