It was an error on my part, I couldn't find the stability guarantee for
XID_Start and Continue. But they are guaranteed stable, just not immutable.
Immutability is the property that things that are not identifiers remain
not identifiers.

On Wed, Jan 22, 2020 at 10:01 AM Corentin Jabot via SG16 <
sg16_at_[hidden]> wrote:

>
>
> On Wed, 22 Jan 2020 at 15:47, Tom Honermann <tom_at_[hidden]> wrote:
>
>> On 1/22/20 2:56 AM, Corentin Jabot via SG16 wrote:
>>
>> XID_Continue and XID_Start are, in fact, stable
>> https://unicode.org/policies/stability_policy.html
>>
>> Can you elaborate? My reading of the stability policy is that once a
>> character has the XID_Start or XID_Continue property that it always will,
>> but that policy doesn't state that (existing or new) characters that don't
>> have those properties can't be granted them in the future.
>>
>
> Which is the stability we care about (and basically the only one Unicode
> defines).
> Identifiers cannot stop being identifiers, well formed code will remain
> well-formed.
>
> (original reply was in reference to :
> Steve responded that they are derived properties and are not guaranteed to
> be stable, but probably will be in practice.
> )
>
>
>> Tom.
>>
>>
>> On Wed, 22 Jan 2020 at 06:23, Tom Honermann via SG16 <
>> sg16_at_[hidden]> wrote:
>>
>>> The summary for the SG16 meeting held January 8th, 2020 is now
>>> available. For those that attended, please review and suggest corrections:
>>> - https://github.com/sg16-unicode/sg16-meetings#january-8th-2020
>>>
>>> The next meeting is scheduled for Wednesday, January 22nd, from
>>> 3:30-5:00pm EST. An invitation (from invite_at_[hidden]) has been
>>> sent to the mailing list and prior attendees. The draft agenda is:
>>> - P1885R0: Naming Text Encodings to Demystify Them
>>> <https://wg21.link/p1885>
>>> - Follow up on recent mailing list discussions.
>>> - Identify and discuss intended use cases.
>>> - P2020R0: Locales, Encodings and Unicode <https://wg21.link/p2020>
>>> - General discussion, corrections, suggestions, etc...
>>>
>>> For any new attendees: The meetings are video conferences conducted via
>>> BlueJeans. If you are planning to attend, please test your system by
>>> visiting https://bluejeans.com/111 before the scheduled meeting time.
>>>
>>> Tom.
>>> --
>>> SG16 mailing list
>>> SG16_at_[hidden]
>>> https://lists.isocpp.org/mailman/listinfo.cgi/sg16
>>>
>>
>>
>> --
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>