[Bug 236115] [toolchain] std::map doesn't have the 'extract' method

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=236115

Conrad Meyer <cem at freebsd.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|New                         |Closed
         Resolution|---                         |FIXED

--- Comment #1 from Conrad Meyer <cem at freebsd.org> ---
Does not reproduce with Clang on head nor GCC 7+.

FreeBSD 11.0 was released in 2016 on Clang 3.8.0 — C++17 didn't exist.  11.1
updated Clang and libc++ to 4.0.0.

Supposedly support for C++17 was introduced in Clang 5.

11.2 updated Clang and libc++ to 6.0.0.  So probably this is a bug in libc++
6.0.0 that will be fixed naturally when it is updated to 7.0.0 or 7.0.1.  In
fact, dim@ already pulled 7.0.1 into 11.x stable: r344213.

Here's libc++ tracking status against full C++17 support, which it describes as
incomplete (still): http://libcxx.llvm.org/cxx1z_status.html .  I think this
item is p0083r3, "Splicing Maps and Sets," marked as Complete in 8.0.

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