question on setting up guix.scm for project development

[Andy Tai <atai@atai.org>]

Hi, guix allows setting up an environment containing all the
dependencies for development of a package; this can be done via a
guix.scm file containing the package definition.

My question is, if I am developing a package which has dependencies
with newer versions than what is available in the guix repo, how can I
use the guix.scm file to bring in the new version of the dependencies?
 As an example:

Say  my package "my-package" has dependencies d1, d2, d3
where d2 in the current guix package repo is at version 0.1.2 but I
need a later release version 0.1.4; so I tried something like this:

----guix.scm---
(use-modules (guix packages)
   ....)

(define-public d2-0.1.4
   (package
       (name "d2")
       (version "0.1.4")

   ...
)


(define-public my-package
   (package
      (name "my-package")
      (version "0.1")
     ...


     (input (list d1 d2-0.1.4 d3...)
    ....
))

my-package

---end guix.scm--


and if I use

guix shell -f -d ./guix.scm

this does not seem to generate an environment that contains the new
dependency, that is d2 version 0.1.4

I wonder how can this made to work?  Ideally no need to create a
private channel or such..  Thanks for info on this.