[Bug 253466] Missing the <concepts> header

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253466

            Bug ID: 253466
           Summary: Missing the <concepts> header
           Product: Base System
           Version: 12.2-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: standards
          Assignee: standards at FreeBSD.org
          Reporter: yuri at freebsd.org

The C++20 standard requires it:
https://en.cppreference.com/w/cpp/concepts/same_as

clang-10 is supposed to have the "concepts" feature partially implemented:
https://clang.llvm.org/cxx_status.html

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