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Showing content from https://en.cppreference.com/w/cpp/language/../error/error_code/../../ndr.html below:

No Diagnostic Required - cppreference.com

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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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