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cppdraft/uaxid/immutable.md

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+[uaxid.immutable]
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+# Annex E (informative) Conformance with UAX #31 [[uaxid]](./#uaxid)
+
+## E.3 R2 Immutable identifiers [uaxid.immutable]
+
+[1](#1)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/uax31.tex#L65)
+
+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[.](#1.sentence-1)
+
+[2](#2)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/uax31.tex#L70)
+
+C++ does not choose to make this guarantee[.](#2.sentence-1)
+
+As scripts are added to Unicode,
+additional characters in those scripts may become available
+for use in identifiers[.](#2.sentence-2)