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package t6260
class Box[X](val x: X) extends AnyVal {
def map[Y](f: X => Y): Box[Y] =
((bx: Box[X]) => new Box(f(bx.x)))(this)
}
object Test {
def map2[X, Y](self: Box[X], f: X => Y): Box[Y] =
((bx: Box[X]) => new Box(f(bx.x)))(self)
def main(args: Array[String]): Unit = {
val f = (x: Int) => x + 1
val g = (x: String) => x + x
map2(new Box(42), f)
new Box("abc") map g
}
}
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