We should probably just get rid of the restriction that ucns cannot design
basic character set member, it doesn't appear to be strongly motivated.

On Wed, May 11, 2022, 22:25 Steve Downey via Liaison <
liaison_at_[hidden]> wrote:

> SG16, in reviewing the addition of the new characters to the basic
> character set found a couple of awful ways it could result in conforming
> code becoming non conforming.
>
> https://isocpp.org/files/papers/P2558R1.html
>
> #include <stdio.h> <https://isocpp.org/files/papers/P2558R1.html#cb2-2> <https://isocpp.org/files/papers/P2558R1.html#cb2-3>#define STR(x) #x <https://isocpp.org/files/papers/P2558R1.html#cb2-4> <https://isocpp.org/files/papers/P2558R1.html#cb2-5>int main() <https://isocpp.org/files/papers/P2558R1.html#cb2-6>{ <https://isocpp.org/files/papers/P2558R1.html#cb2-7> printf("%s", STR(\u0024)); // UCN for $ was allowed, now it is not <https://isocpp.org/files/papers/P2558R1.html#cb2-8>}
> and
>
> #include <stdio.h> <https://isocpp.org/files/papers/P2558R1.html#cb3-2> <https://isocpp.org/files/papers/P2558R1.html#cb3-3>#define EAT(x) <https://isocpp.org/files/papers/P2558R1.html#cb3-4> <https://isocpp.org/files/papers/P2558R1.html#cb3-5>int main() <https://isocpp.org/files/papers/P2558R1.html#cb3-6>{ <https://isocpp.org/files/papers/P2558R1.html#cb3-7> EAT(\u0024) // UCN for $ was allowed, now it is not <https://isocpp.org/files/papers/P2558R1.html#cb3-8>}
>
> I am not sure this was noticed in reviewing N2701 but thought I'd bring it
> to your attention.
> SG16 had consensus to forward this to EWG.
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