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trait Map[A, +C] {
def ++ [B1 >: C] (kvs: Iterable[Tuple2[A, B1]]): Map[A, B1] = this
def ++ [B1 >: C] (kvs: Iterator[Tuple2[A, B1]]): Map[A, B1] = this
}
class ListMap[A, +B] extends Map[A, B] {}
object ListMap {
def empty[X, Y] = new ListMap[X, Y]
def apply[A1, B2](elems: Tuple2[A1, B2]*): Map[A1, B2] = empty[A1,B2].++(elems.iterator)
}
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