[asdf-devel] Ordering of system :depends-on elements

A few projects in quicklisp work something like this:

;;; foo.asd

(defsystem foo ...)

(defsystem foo-extra ...)

;;; bar.asd

(defsystem bar :depends-on (:foo-extra :foo))

With asdf 2, (asdf:load-system "bar") seems to work fine, I guess because asdf 2 does the equivalent of find-system on the elements from right-to-left.

With asdf 3, it doesn't seem to work fine, I guess because asdf 3 does the equivalent of find-system on the elements from left-to-right.

Are those guesses correct?

What's the best way to have a system definition that works equally well in asdf2 and asdf3 in this kind of situation?

Zach