I believe the diagnostics you receive are correct — the later symbols do
not have the XID_Start property, e.g.,
    https://codepoints.net/U+2103

AlisdairM

> On 30 Jun 2024, at 10:56, Mateusz Pusz via SG16 <sg16_at_[hidden]> wrote:
>
> Hi,
>
> During the recent LEWGI discussion on the units library, people in the room suggested that in addition to the regular "ASCII" version, we should also provide Unicode symbols for unit identifiers. It seems that with P1949R7, this could be possible.
>
> However, when I tried this in the code, I was able to make the following work:
>
> inline constexpr auto µΩ = micro<si::ohm>;
>
> but not:
>
> inline constexpr auto ℃ = degree_Celsius;
> inline constexpr auto ° = degree;
> inline constexpr auto ′ = arcminute;
> inline constexpr auto ″ = arcsecond;
>
> Are those outside of the supported range and should not be supported, or is it just the lack of proper support in the compilers I use (gcc-14 and clang-18)?
>
> Even if this can work, is it a good idea?
>
> Best
>
> Mat
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