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
505. Conditionally-supported behavior for unknown character escapesSection: 5.13.3 [lex.ccon] Status: CD1 Submitter: Mike Miller Date: 14 Apr 2005[Voted into WP at the October, 2006 meeting.]
The current wording of 5.13.3 [lex.ccon] paragraph 3 states,
If the character following a backslash is not one of those specified, the behavior is undefined.
Paper J16/04-0167=WG21 N1727 suggests that such character escapes be ill-formed. In discussions at the Lillehammer meeting, however, the CWG felt that the newly-approved category of conditionally-supported behavior would be more appropriate.
Proposed resolution (April, 2006):
Change the next-to-last sentence of 5.13.3 [lex.ccon] paragraph 3 from:
If the character following a backslash is not one of those specified, the behavior is undefined.
to:
Escape sequences in which the character following the backslash is not listed in Table 6 are conditionally-supported, with implementation-defined semantics.
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