[Bug 272654] The feature std::binary_function that has to be removed in C++17 isn't removed in clang-15 in FreeBSD 13.2 STABLE

From: <bugzilla-noreply_at_freebsd.org>
Date: Sat, 22 Jul 2023 08:53:36 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=272654

            Bug ID: 272654
           Summary: The feature std::binary_function that has to be
                    removed in C++17 isn't removed in clang-15 in FreeBSD
                    13.2 STABLE
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: misc
          Assignee: bugs@FreeBSD.org
          Reporter: yuri@freebsd.org

This code:
> #include <functional>
> 
> class X : public std::binary_function<int,int,int> {
> };

succeeds when compiled with --std=c++17, despite the C++ standard requiring it
to be removed in C++17:
https://en.cppreference.com/w/cpp/utility/functional/binary_function

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