You don't need `var` in any of those procs because you are using ref objects
and you are modifying the memory pointed to by the reference, not the reference
itself.
i.e. this compiles
type
Child* = ref object
value: int
Parent* = ref object
child: Child
proc set_value*(self: Child, value: int): Child {.discardable.} =
self.value = value
return self
proc get_child*(self: Parent): Child {.discardable.} =
let child = Child()
self.child = child
return child
let parent = Parent()
parent.get_child().set_value(10)
Run
