program T {
  property P { x: int = 0, y: int = 7, next: P }
  function bump(p: P) -> void { p.x = p.x + 100 }
  entry {
    let a = new P
    print(a.y)            # 7 default
    a.x = 5
    let b = a
    b.x = 9
    print(a.x)            # 9 (reference)
    bump(a)
    print(a.x)            # 109
    let c = new P
    c.x = 2
    a.next = c
    print(a.next.x)      # 2 chained
    a.next.x = 42
    print(c.x)           # 42
  }
}