[Bug 255374] C++20 features (headers) std::concepts, std::format, std::numbers, std::source_location, etc. are missing

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=255374

--- Comment #31 from Mark Millard <marklmi26-fbsd@yahoo.com> ---
(In reply to Mark Millard from comment #29 and #30)

https://lists.freebsd.org/archives/freebsd-standards/2023-June/000502.html

from/for: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=271931

and is about using -fexperimental-library to enable use of std::ranges:copy .
It did enable such use.

Other examples of reports of features being missing may well find
some of them available if -fexperimental-library had not been used
but is added to the compile's command line.

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