Why do `listOfLists + list` resolve to `operator f...

# announcements

[marstran]

Why do listOfLists + list resolve to operator fun <T> Iterable<T>.plus(elements: Iterable<T>): List<T> instead of operator fun <T> Iterable<T>.plus(element: T): List<T> here? I would expect this snippet to print [[1,2,3]] instead of `[1,2,3]`:

val listOfLists: List<List<Int>> = listOf()    
val list = listOf(1,2,3)

val newList = listOfLists + list
println(newList)