fun testBinaryPlus(d: dynamic): dynamic {
  return d + 1
}

fun testBinaryMinus(d: dynamic): dynamic {
  return d - 1
}

fun testMul(d: dynamic): dynamic {
  return d * 2
}

fun testDiv(d: dynamic): dynamic {
  return d / 2
}

fun testMod(d: dynamic): dynamic {
  return d % 2
}