Hi,

The “bug“:

--8<---------------cut here---------------start------------->8---
$ ls channels.scm
ls: cannot access 'channels.scm': No such file or directory

$ guix time-machine -q -C channels.scm -- help
guix time-machine: error: 'channels.scm' did not return a list of channels
--8<---------------cut here---------------end--------------->8---

That’s incorrect.  What I expect is something as:

--8<---------------cut here---------------start------------->8---
$ ls foo.scm
ls: cannot access 'foo.scm': No such file or directory

$ guix time-machine -q -C foo.scm -- help
guix time-machine: error: failed to load 'foo.scm':
ice-9/boot-9.scm:2190:9: In procedure primitive-load-path: Unable to find file "guix/foo.scm" in load path
--8<---------------cut here---------------end--------------->8---

Although the second part can be confusing for regular user.  And
although I think the message is also incorrect.

Well, the story is about ’load*’ from module (guix ui).  Using this
trivial patch with some ’pk’.