iterator_in_iterator.nim

type Node = object
  nodes: seq[Node]

iterator all(n: Node): Node =
  for node in n.nodes:
    for n in node.all():
      yield n
      
# Error: recursive dependency: 'all'

iterator_in_iterator2.nim

type Node = object
  nodes: seq[Node]

iterator all(n: Node): Node
iterator all(n: Node): Node =
  for node in n.nodes:
    for n in node.all():
      yield n
      
# Error: implementation of 'all' expected