This is an unofficial snapshot of the ISO/IEC JTC1 SC22 WG21 Core Issues List revision 117b. See http://www.open-std.org/jtc1/sc22/wg21/ for the official list.
2025-08-11
1963. Implementation-defined identifier charactersSection: 5.11 [lex.name] Status: CD4 Submitter: Richard Smith Date: 2014-07-07[Moved to DR at the May, 2015 meeting.]
The grammar in 5.11 [lex.name] includes the production,
The rule for “other implementation-defined characters” is a holdover from before the introduction of universal-character-names, intended to allow the use of non-ASCII national characters in identifiers. However, since all characters outside the basic source character set are now conceptually mapped to universal-character-names in translation phase 1, there is no longer a need for such a provision and it should be removed.
Proposed resolution (April, 2015):
Change the grammar in 5.11 [lex.name] as follows:
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