Recursive buildSequence does not compile

[Temp1ar]

class Node {
    val children : List<Node> = emptyList()
}

fun Node.subtree() = kotlin.coroutines.experimental.buildSequence {
    val me = this@subtree
    yield(me)
    //me.children.forEach { yieldAll(it.subtree()) }
    for(child in me.children) {
        for (ancestor in child.subtree())
            yield(ancestor)
    }
}

The commented code fails to compile with "No resolved code for yieldAll" generator exception
Uncommented code with recursive type dependency error.
Can i somehow get it working?
#7 issue is probably related.

[Temp1ar]

As a workaround i used approach from stackoverflow using lazyPlus:

fun Node.subtree2(): Sequence<Node> {
    return sequenceOf(this) lazyPlus {
        children.asSequence().flatMap { it.subtree2() }
    }
}

[elizarov]

Hm... works for me in the laters version of Kotlin. Anyway, if you are running it recursive type problem, you should just specify type explicitly. In this case you can either use buildSequence<Node> or add type annotation to the function fun Node.subtree(): Sequence<Node>