On Tue, Sep 15, 2020, 23:53 Tom Honermann <tom_at_[hidden]> wrote:

> On 9/15/20 12:09 PM, Corentin Jabot via SG16 wrote:
>
>
>
> On Tue, Sep 15, 2020, 18:03 Steve Downey via SG16 <sg16_at_[hidden]>
> wrote:
>
>> Thanks Corentin!
>> I'll have these to chase down now. The problem I keep running into is
>> making sure that the various proposals are adopted, and which ones
>> have so many caveats that they aren't good examples. Python, Rust, and
>> JS look solid.
>>
>
> My understanding is that rust hasn't adopted it yet.
>
> Swift is a really good example of what NOT to do: some emojis are
> considered symbols ( swift has arbitrary symbols) while some are considered
> variable name.
>
> Swift does exactly what C++ currently does for identifiers. Compare:
>
> -
> https://docs.swift.org/swift-book/ReferenceManual/LexicalStructure.html#ID412
>
> At the very bottom of the same page, swift describes operators.
Which is not an issue C++ has
So in Swift, ☹️ is an operator, 🙂 is an identifier.
More description of the issue here
https://lists.swift.org/pipermail/swift-evolution/Week-of-Mon-20160912/027112.html

The takeaway is that a careless emoji support in identifiers impacts C++
future ability to give special meaning to codepoints recognized as symbols,
if we ever wanted to do that.



> - http://eel.is/c++draft/lex.name#1
>
> Tom.
>
>
>> On Tue, Sep 15, 2020 at 11:44 AM Corentin Jabot via SG16
>> <sg16_at_[hidden]> wrote:
>> >
>> > C#
>> https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/language-specification/lexical-structure#identifiers
>> (not exactly uax)
>> >
>> > Rust https://rust-lang.github.io/rfcs/2457-non-ascii-idents.html
>> >
>> > Swift
>> https://forums.swift.org/t/a-path-forward-on-rationalizing-unicode-identifiers-and-operators/6735
>> (not exactly uax)
>> >
>> > Erlang
>> https://www.erlang.org/erlang-enhancement-proposals/eep-0040.html
>> >
>> > Julia https://docs.julialang.org/en/v1/manual/variables/ (not exactly
>> uax)
>> >
>> > Python 3 https://www.python.org/dev/peps/pep-3131/
>> >
>> > JS https://tc39.es/ecma262/
>> >
>> >
>> > On Tue, Sep 15, 2020, 17:23 Steve Downey via SG16 <
>> sg16_at_[hidden]> wrote:
>> >>
>> >> I know we've discussed them before, but when trying to track down
>> >> actual references for purposes of including in a paper, I keep failing
>> >> at Google.
>> >>
>> >> Asking for help so that R7 will be better.
>> >>
>> >> PR's also welcome on
>> https://github.com/steve-downey/papers/blob/master/d1949.md
>> >> --
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>> >
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>