[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 #29 from Mark Millard <marklmi26-fbsd@yahoo.com> ---
(In reply to Yuri Victorovich from comment #23)
[Also for Dimitry Andric vs. my original misinterpretation
of __has_feature(experimental_library)]

Hmm. Looks like -fexperimental-library enables
__has_feature(experimental_library) and this is for
client code use of an installed libc++ .

Have you tried using -fexperimental-library when
you test for std::format "working"?

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