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[2026-06 CWG Motion 9] P3658R1 Adjust identifier following new Unicode recommendations #9132

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[2026-06 CWG Motion 9] P3658R1 Adjust identifier following new Unicode recommendations #9132

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ce8b6b7
P3658R1 Adjust identifier following new Unicode recommendations
notdanhan Jun 14, 2026
4ea8f31
fixup: Reflow lines in latex document
notdanhan Jun 15, 2026
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6 changes: 4 additions & 2 deletions source/lex.tex
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Original file line number Diff line number Diff line change
Expand Up @@ -901,14 +901,16 @@
\begin{bnf}
\nontermdef{identifier-start}\br
nondigit\br
\textnormal{an element of the translation character set with the Unicode property XID_Start}
\textnormal%
{an element of the translation character set with the Unicode property XID_Start or the Unicode property ID_Compat_Math_Start}
\end{bnf}

\begin{bnf}
\nontermdef{identifier-continue}\br
digit\br
nondigit\br
\textnormal{an element of the translation character set with the Unicode property XID_Continue}
\textnormal%
{an element of the translation character set with the Unicode property XID_Continue or the Unicode property ID_Compat_Math_Continue}
\end{bnf}

\begin{bnf}
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14 changes: 8 additions & 6 deletions source/uax31.tex
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Expand Up @@ -31,15 +31,17 @@
where \tcode{<Start>} has the XID_Start property,
\tcode{<Continue>} has the XID_Continue property, and
\tcode{<Medial>} is a list of characters permitted between continue characters.
For \Cpp{} we add the character \unicode{005f}{low line}, or \tcode{_},
to the set of permitted \tcode{<Start>} characters,
the \tcode{<Medial>} set is empty, and
the \tcode{<Continue>} characters are unmodified.
\UAX{31} also specifies some standard profiles,
including the Mathematical Compatability Notation profile.
For \Cpp{} we apply the Mathematical Compatability Notation profile,
and we add the character \unicode{005f}{low line}, or \tcode{_},
to the set of permitted \tcode{<Start>} characters.
The \tcode{<Medial>} set is empty.
In the grammar used in \UAX{31}, this is
\begin{outputblock}
<Identifier> := <Start> <Continue>*
<Start> := XID_Start + @\textrm{\ucode{005f}}@
<Continue> := <Start> + XID_Continue
<Start> := XID_Start + ID_Compat_Math_Start + @\textrm{\ucode{005f}}@
<Continue> := <Start> + XID_Continue + ID_Compat_Math_Continue
\end{outputblock}

\pnum
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