[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 #30 from Mark Millard <[email protected]> ---
(In reply to Mark Millard from comment #28)
[Also for Dimitry Andric vs. my original misinterpretation
of __has_feature(experimental_library)]

My question in #28 may be incoherent via
misinterpreting what controls __has_feature(experimental_library)
and when it is relevant .

Turns out it seems to be -fexperimental-library use when
building client code, if I read the materials correctly.

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