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

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From: <bugzilla-noreply_at_freebsd.org>
Date: Wed, 17 May 2023 06:55:44 UTC

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

--- Comment #25 from Mark Millard <marklmi26-fbsd@yahoo.com> ---
(In reply to Yuri Victorovich from comment #23)

Looking, I see in main [so: 14 with LLVM 15.0.7 materials] :

# more /usr/include/c++/v1/format
. . .
#ifndef _LIBCPP_FORMAT
#define _LIBCPP_FORMAT

. . .
#include <__assert> // all public C++ headers provide the assertion handler
// Make sure all feature-test macros are available.
#include <version>
// Enable the contents of the header only when libc++ was built with
experimental features enabled.
#if !defined(_LIBCPP_HAS_NO_INCOMPLETE_FORMAT)

. . .

#endif // !defined(_LIBCPP_HAS_NO_INCOMPLETE_FORMAT)

#endif // _LIBCPP_FORMAT

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