2.9.3 List states under "Asynchronous Lists":
http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_09_03_02
| If job control is disabled (see set, -m), the standard input for an
| asynchronous list, before any explicit redirections are performed,
| shall be considered to
Date:Sun, 29 Oct 2017 21:47:43 +
From:Martijn Dekker
Message-ID: <6432d459-75de-0afe-6716-7960e7a0a...@inlv.org>
| | In all cases, explicit redirection of standard input shall
| | override this activity.
That last sentence just shouldn't be