Hi, I want to create an array that references itself in its second element like this | array | array := #(1 nil). array at: 2 put: array. array I thought that the following would work | array elements | array := Array new. elements := Array with: 1 with: array. array becomeForward: elements. array And it does in a workspace, but not in my code where it looks like this parseArray | array elementsArray | array := Array new. self storeReference: array. elementsArray := self parseArrayInternal. elementsArray size > 0 ifTrue: [ array becomeForward: elementsArray ]. ^ array The #become[Forward] is necessary because the array size is not known up front and one of its elements might refer to itself, possibly deeper down. So I guess I am doing something wrong, the question is what ? Or is there another way to achieve the same effect ? Thx, Sven