cppdraft_translate/cppdraft/uaxid/immutable.md

[uaxid.immutable]

Annex E (informative) Conformance with UAX #31 [uaxid]

E.3 R2 Immutable identifiers [uaxid.immutable]

1

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An implementation may choose to guarantee that the set of identifiers will never change by fixing the set of code points allowed in identifiers forever.

2

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C++ does not choose to make this guarantee.

As scripts are added to Unicode, additional characters in those scripts may become available for use in identifiers.