twiddle_object.rs

use std::io::println;
use std::result::{Result, Ok};
use std::task::{spawn};

pub struct Foo(int);

pub trait Bar {
    fn baz(&self);
}

impl Bar for Foo {
    pub fn baz(&self) { println("yay me?"); }
}

pub struct Froobie(~Bar);


fn main() {
    println("hello world");
    let v = 1;

    do spawn {
        let foo = Foo(1);
        let r: Result<~Bar, ()> = Ok(foo as ~Bar);
        let froobie = match r {
            Ok(f) => Froobie(~f),
            Err(_) => {}
        };
        (*froobie).baz();
    }
}