bug#38715: Issue with guile-email: unbound variable

[Jelle Licht]

Hey guix,

Pretty recently, it seems something weird is happening when playing with
guix on the REPL.

On master, 5a947e118fb72b8fb1fd0c8d0b783fc7cde0c461:

--8<---------------cut here---------------start------------->8---
$ guix repl
> (use-modules (gnu packages gnupg))
While compiling expression:
error: guile-email: unbound variable.
--8<---------------cut here---------------end--------------->8---

Loading up the `(gnu packages mail)' module first seems to work around
the compilation error. My best guess is that this has something to do
with a circular reference between guile modules, but I am not certain on
how to easily debug (and fix) this.

- Jelle