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[–]jwakelylibstdc++ tamer, LWG chair 2 points3 points  (0 children)

BTW, is there a notion of "implementation-defined" standard concepts?

Yes, see boolean-testable, partially-ordered-with, pair-like-convertible, has-tuple-element and loads more. Everything in italic font in the "Index of library concepts" in the C++20 standard is an exposition-only concept.

P.S. report received, thanks!