Created on 2019-10-23.00:00:00 last changed 3 weeks ago
Additional notes (January, 2023):
Forwarded to SG12 with paper issue 1413, by decision of the CWG and SG12 chairs.
(From National Body comment US 141 on the C++20 DIS.)
Subclause 15.6.1 [cpp.replace.general] paragraph 13 specifies:
If there are sequences of preprocessing tokens within the list of arguments that would otherwise act as preprocessing directives, [ Footnote: ...] the behavior is undefined.
Undefined behavior during lexing is not acceptable. The behavior ought to be ill-formed or conditionally-supported. Some implementation support an #if section, others reject that.
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