type Foo {
    field: String
}

impl Foo {
   fn new(arg: String) {
    println "Foo.init(" + arg + ")";
    self.field = "init";
  }
}

let foo = Foo("one"); // out: Foo.init(one)
foo.field = "field";

let foo2 = foo.new("two"); // out: Foo.init(two)
println foo2; // out: <instance "Foo">

// Make sure init() doesn't create a fresh instance.
println foo.field; // out: init