Hello,

> trick ensures that we get the system that current at the time of the
> monadic bind, whereas your change get the system and target that are
> current at the time of the call.
>
> It’s a terrible pitfall, I know…

Ok, then, I used the same trick to read %current-target-system at bind
time. With this trick, target is set to the value passed to the guix
system command (it is #f otherwise).

WDYT?

Mathieu