[davexunit]

>It'd be interesting to see Guix expressions that actually mix other scheme libraries or concepts, rather than just taking Nix expressions and removing the syntax.

We already do this. Our build scripts are written in Guile, not Bash like in Nix, and they take advantage of Guile's standard library which has things like a pattern matcher, an HTTP client and server, a POSIX interface, a foreign-function interface, an XML parser, etc. We use third-party libraries such as guile-json and guile-charting in some of our tools, as well.