assertEqualToResult failing with simple rust / rust! evaluation test

[AdrickTench]

The following simple tests fail:

!(assertEqualToResult (rust !(+ 1 2)) (3))
;; (loonit_failureR  (equal_enough_for_test  (3) (3)))[((Error  (got  (3)) (expected  (3))))]

!(assertEqualToResult (rust! (+ 1 2)) (3))
;; (loonit_failureR  (equal_enough_for_test  () (3)))[((Error  (got  ()) (expected  (3))))]

The first failure seems like an issue with assertEqualToResult, surely 3 = 3.
The second failure is also a result of rust! <atom> not returning when rust !<atom> does, but I believe those forms should be identical.