Why is BOM required to use unicode in tokens?

[Patrick Schluter]

On Wednesday, 16 September 2020 at 00:22:15 UTC, Steven 
Schveighoffer wrote:
> On 9/15/20 8:10 PM, James Blachly wrote:
>> On 9/15/20 10:59 AM, Steven Schveighoffer wrote:
>>>[...]
>> 
>> Steve: It sounds as if the spec is correct but the glyph 
>> (codepoint?) range is outdated. If this is the case, it would 
>> be a worthwhile update. Do you really think it would be 
>> rejected out of hand?
>> 
>
> I don't really know the answer, as I'm not a unicode expert.
>
> Someone should verify that the character you want to use for a 
> symbol name is actually considered a letter or not. Using 
> phobos to prove this is kind of self-defeating, as I'm pretty 
> sure it would be in league with DMD if there is a bug.

I checked, it's not a letter. None of the math symbols are.

>
> But if it's not a letter, then it would take more than just 
> updating the range. It would be a change in the philosophy of 
> what constitutes an identifier name.
>