[Voted into the WP at the November, 2010 meeting as paper N3146.]

Notes from the August, 2010 meeting:

CWG expressed interest in an approach by which all characters except for those in specifically-excluded categories would be acceptable identifier characters. This suggestion will be brought up with WG14 as a liaison matter in hopes of agreeing on a uniform approach between C and C++.

1. “Combining characters should not appear as the first character of an identifier.” [Reference: ISO/IEC TR 10176:2003 (Annex A)] This is not reflected in FCD.

2. Restrictions on the first character of an identifier are not observed as recommended in TR 10176:2003. The inclusion of digits (outside of those in the basic character set) under identifer-nondigit is implied by FCD.

3. It is implied that only the “main listing” from Annex A is included for C++. That is, the list ends with the Special Characters section. This is not made explicit in FCD. Existing practice in C++03 as well as WG 14 (C, as of N1425) and WG 4 (COBOL, as of N4315) is to include a list in a normative Annex.

4. Specify width sensitivity as implied by C++03: \uFF21 is not the same as A. Case sensitivity is already stated in 5.10 [lex.name].