Recursively propagate build-system 'arguments' to dependency packages?

[Myles English]

Trying to define a package to be compiled by ghc-8, and I think all of
its dependencies must also be compiled by ghc-8 rather than ghc (which
is version 7).  This is easy to do with one package, e.g..:

(define-module (my-packages myhaskell)
 ...
  #:use-module ((gnu packages haskell) #:prefix haskellmain:))

(define-public ghc-hunit8
  (package
    (inherit haskellmain:ghc-hunit)
    (arguments `(#:haskell ,ghc-8))))

To do that recursively for all the dependencies seems Too Difficult so,
is there a way to do something like --with-input=ghc=ghc-8 but with the
build-system arguments?  Perhaps doing the work in between the Bag and
the Derivation?

Myles