[Bug 291228] C++ feature std::execution::unseq is missing in std::execution

From: <bugzilla-noreply_at_freebsd.org>
Date: Wed, 26 Nov 2025 07:27:06 UTC 
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=291228

            Bug ID: 291228
           Summary: C++ feature std::execution::unseq is missing in
                    std::execution
           Product: Base System
           Version: 15.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: misc
          Assignee: bugs@FreeBSD.org
          Reporter: yuri@freebsd.org

The support table (https://en.cppreference.com/w/cpp/compiler_support.html)
lists std::execution::unseq as implemented but it is missing in 15 STABLE.

The example from
https://en.cppreference.com/w/cpp/algorithm/execution_policy_tag.html fails to
compile with -DPARALLEL.

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