```class Node(val nodes: List<Node>) fun pr...

# intellij

[horse_badorties]

class Node(val nodes: List<Node>)

fun preOrder(node: Node) = node.nodes.forEach {
    // ...
    preOrder(it)
}

does not compile using kotlin version 1.1.4-2 due to Type checking has run into a recursive problem. Easiest workaround: specify types of your declarations explicitly

It compiles using fun preOrder(node: Node): Unit = ... but then there is a Redundant 'Unit' return type warning?!

[yole]

you should simply convert this to a block body

[horse_badorties]

yes, that's what I have done.
I post it here because the warning might just be wrong in this case, no?

[yole]

yes, it kind of is, but it's too difficult to detect that it's wrong

[horse_badorties]

fair enough