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

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=291228

--- Comment #2 from Mark Millard <marklmi26-fbsd@yahoo.com> ---
The system llvm19 libc++ has . . .

contrib/llvm-project/libcxx/modules/std/execution.inc

with:

// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM
Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#ifdef _LIBCPP_ENABLE_EXPERIMENTAL
export namespace std {
  // [execpol.type], execution policy type trait
  using std::is_execution_policy;
  using std::is_execution_policy_v;
} // namespace std

export namespace std::execution {
  // [execpol.seq], sequenced execution policy
  using std::execution::sequenced_policy;

  // [execpol.par], parallel execution policy
  using std::execution::parallel_policy;

  // [execpol.parunseq], parallel and unsequenced execution policy
  using std::execution::parallel_unsequenced_policy;

  // [execpol.unseq], unsequenced execution policy
  using std::execution::unsequenced_policy;

  // [execpol.objects], execution policy objects
  using std::execution::par;
  using std::execution::par_unseq;
  using std::execution::seq;
  using std::execution::unseq;
} // namespace std::execution
#endif // _LIBCPP_ENABLE_EXPERIMENTAL

So your reference material that you based the submittal on
is just wrong as of llvm19 --unless it considers requiring
use of -fexperimental-library to enable that part of the
library as still being supported.

And, my earlier report shows it is not actually supported
even with -fexperimental-library specified.

It looks to be an upstream issue, not a FreeBSD one. This
was submitted to the wrong place.

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