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object Test {
abstract class Number
case class MyInt(n: Int) extends Number
case class MyDouble(d: Double) extends Number
trait Term[+a]
case class Cell[a](var x: a) extends Term[a]
final case class NumTerm(val n: Number) extends Term[Number]
def f[a](t: Term[a], c: Cell[a]) {
t match {
case NumTerm(n) => c.x = MyDouble(1.0)
}
}
val x: Term[Number] = NumTerm(MyInt(5))
def main(args: Array[String]) {
val cell = Cell[Number](MyInt(6))
Console.println(cell)
f[Number](new NumTerm(MyInt(5)), cell)
Console.println(cell)
}
}
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