Created on 2019-10-23.00:00:00 last changed 3 weeks ago
Additional notes (January, 2023):
Forwarded to SG12 with paper issue 1410, by decision of the CWG and SG12 chairs.
(From National Body comment US 143 on the C++20 DIS.)
Subclause 15.6.4 [cpp.concat] paragraph 3 specifies:
If the result begins with a sequence matching the syntax of universal-character-name, the behavior is undefined. [Note: ... --end note] If the result is not a valid preprocessing token, the behavior is undefined.
Undefined behavior during lexing is not acceptable. The behavior ought to be well-defined, ill-formed, or conditionally-supported.
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