If I do

$ guix environment --ad-hoc guix guile
$ guile
> (use-modules (guix http-client))

it's ok.

If I do

$ guix environment --ad-hoc guix guile-next ;; <-- note the "-next"
$ guile
> (use-modules (guix http-client))

Then there is no code for module http-client

Is there any hope that I can load some guix modules from within a
guile-next prompt ?

I'm asking this because I am exploring Culturia and that requires
guile-next.
I'd like to use the guix http-client and the Culturia machinery together