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  pipeline workers => 4,
    in  { get_next_task() }
    out { do_stuff_with_result(shift->recv) };

=head1 DIAGNOSTICS

=head2 Task errors

Error messages resulting from a C<die> or C<croak> in task code executed in a
worker process are rethrown in the parent process when the condition variable's
C<recv> method is called.

=head2 "AnyEvent::ProcessPool::Worker: ..." (warning)

When a worker sub-process emits output to C<STDERR>, the process pool warns
the message out to its own C<STDERR>.

=head2 "error launching worker process: ..."

Thrown when a worker sub-process failed to launch due to an execution error.