Hello,

Ludovic Courtès <ludo@gnu.org> writes:
> Could you write it in functional style using a vhash (info "(guile)
> VHashes")?  You’ll probably need two list traversals: one to build the
> user/key mapping, and one to compute the list of users.

I thought that as the vhash data structure inherited the drawbacks of
vlist, it would not be worth using in place of a hash table, but you’re
saying that it’s still a better (more functional) data structure, noted.

Here is the new patch (and I also forgot that appending short lists to
long lists was not great, so I do all the appending at the end of the
function now).