> “Delete the generations matching @var{patterns} or ... when omitted.”

> Or what actually?  I would expect it to delete all the generations but
> the current one when PATTERN is omitted, right?

‘--delete-generations’ deletes everything and points the profile to the
zeroth generation.  There are range patterns if you want to keep the
current generation.  I prefer the current behavior.

> Ideally this factorization would go in a patch of its own, before the
> one that adds --delete-generations.  Is that doable for you?

I think so.

> No need for ‘begin’ in the body of a ‘cond’ clause.

Why?  Is it specified somewhere?  Or is it easier to read?

> Why is there this big hunk?  If it’s just reindenting, could you arrange
> to remove this hunk?

I couldn’t avoid reindenting since the word “cond” is longer than “if.”
However, I used this opportunity to move a couple of things around.  I’d
prefer to keep this change.

Frankly, I think that the module should be reorganized at some point
(especially the ‘guix-package’ function).  I don’t like that functions
don’t fit on the screen.