overloading in package object

A.scala

import foo._
object A {
  def main(args: Array[String]) {
    println(plus(1))
    println(plus(1, 3))
  }
}
//scalac package.scala
//scalac A.scala
//scala A

package.scala

package object foo {
  def plus(x: Int):Int = x + 1
  def plus(x: Int, inc: Int):Int = x + inc
}