Created on 2019-10-23.00:00:00 last changed 3 weeks ago
Additional notes (January, 2023):
Forwarded to SG12 with paper issue 1408, by decision of the CWG and SG12 chairs.
(From National Body comment US 131 on the C++20 DIS.)
Subclause 15.3 [cpp.include] paragraph 4 specifies:
If the directive resulting after all replacements does not match one of the two previous forms, the behavior is undefined.
Undefined behavior during lexing is not acceptable. This ought to be ill-formed.
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