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    echo foo # Can be captured
    echo foo >&2 # Can be captured
    echo foo >&3 # Cannot be captured (with open3)

    # Currently mixes output due to fd 3 not buffered
    parallel 'echo {} start >&3;sleep 10;echo {} end >&3' ::: a b c 3>
+out.file

    # This currently works
    parallel 'echo {} start >&2;sleep 10;echo {} end >&2' ::: a b c 2>
+out.file