object nameddefaults {

  def foo(first: Int, second: Int = 2, third: Int = 3) = first + second
  
  var x = 1
  var y = 2

  foo(1, 2, 3)

  foo(1, 2)

  foo(1)

  // named and missing arguments
  
  foo(first = 1, second = 3)

  foo(second = 3, first = 1)

  foo(first = 2, third = 3)

  foo(2, third = 3)
  
  // same but with non-idempotent expressions

  foo(first = x, second = y)

  foo(second = x, first = y)

  foo(first = x, third = y)

  foo(x, third = y)
}