// "Create member function 'FooIterator.next'" "true" class FooIterator { operator fun hasNext(): Boolean { return false } } class Foo { operator fun iterator(): FooIterator { TODO("not implemented") } } operator fun Any.component1(): Int { return 0 } operator fun Any.component2(): Int { return 0 } fun foo() { for ((i: Int, j: Int) in Foo()) { } }