toplevel out-of-order objects.

[samrushing]

Segfault. Looks like some extra care is needed with toplevel objects.

Repro:

(define some-object (object-maker))
;;... use some-object ...
(include "object.scm")

Need to look at reorder-fix and/or top[N] references...

[samrushing]

This is caused by cycles in the dependency graph. At the very least it should generate a warning.