unbound-control to display trust anchors?

[Stephane Bortzmeyer]

On Tue, Aug 28, 2018 at 12:34:13PM +0200,
 Willem Toorop via Unbound-users <unbound-users at nlnetlabs.nl> wrote 
 a message of 17 lines which said:

> [willem at bela ~]$ dig @localhost trustanchor.unbound. TXT CH +short
> ". 19036 20326"
> "2018-08-12.automated-ksk-test.research.icann.org. 3934"

Thanks, but it seems to work with very recent Unbounds only (the one
in Debian stable, or the one in Ubuntu LTS reply REFUSED).