No Diagnostic Required - cppreference.com (original) (raw)
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"No diagnostic required" indicates that some phraseology is ill-formed according to the language rules, but a compiler need not issue any diagnostic or error message. Usually, the reason is that trying to detect these situations would result in prohibitively long compile times.
If such a program is executed, the behavior is undefined.
[edit] See also
C documentation for No Diagnostic Required
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