I’m getting an warning which I don’t know how to stifle. Can someone help me understand exactly what the warning is telling me and how to fix it?

```
Warning:(159, 67) match may not be exhaustive.
It would fail on the following inputs: (((_ : Int), (_ : Int)), (_, (_ : Int), _)), (((_ : Int), (_ : Int)), (_, _, (_ : Int))), (((_ : Int), (_ : Int)), (_, _, _)), (((_ : Int), (_ : Int)), _), (((_ : Int), _), (_, (_ : Int), (_ : Int))), (((_ : Int), _), (_, (_ : Int), _)), (((_ : Int), _), (_, _, (_ : Int))), (((_ : Int), _), (_, _, _)), (((_ : Int), _), _), ((_, (_ : Int)), (_, (_ : Int), (_ : Int))), ((_, (_ : Int)), (_, (_ : Int), _)), ((_, (_ : Int)), (_, _, (_ : Int))), ((_, (_ : Int)), (_, _, _)), ((_, (_ : Int)), _), ((_, _), (_, (_ : Int), (_ : Int))), ((_, _), (_, (_ : Int), _)), ((_, _), (_, _, (_ : Int))), ((_, _), (_, _, _)), ((_, _), _), (_, (_, (_ : Int), (_ : Int))), (_, (_, (_ : Int), _)), (_, (_, _, (_ : Int))), (_, (_, _, _)), (_, _)
val (minX:Int, minY:Int) = stationPositions.fold((maxX,maxY)) {
```

Here is the code. The error occurs on the line which sets the value of `minX`

and `minY`

, but not on the code that sets `maxX`

and `maxY`

. In my actual program the value of `stationPositions`

is a much larger array than shown here with just 3 entries.

```
object TestingMetroMap {
def main(argv:Array[String]):Unit = {
val stationPositions:Array[(String,Int,Int)] = Array(
// station-name, x-position, y-position, useful for drawing a metro map
("Abbesses", 308, 536 ),
("Alexandre Dumas", 472, 386 ),
("Alma Marceau", 193, 404 ))
val (maxX: Int, maxY: Int) = stationPositions.foldLeft((0, 0)) {
case ((maxX, maxY), (_, x, y)) => (math.max(x, maxX), math.max(y, maxY))
}
val (minX:Int, minY:Int) = stationPositions.fold((maxX,maxY)) {
case ((minX:Int, minY:Int), (_, x:Int, y:Int)) => (math.min(x,minX), math.min(y,minY))
}
println(List(minX, minY, maxX, maxY))
}
}
```