struct Thingy {
    x: int,
    y: int
}

impl ToStr for Thingy {
    fn to_str(&self) -> ~str {
        format!("\\{ x: {}, y: {} \\}", self.x, self.y)
    }
}

struct PolymorphicThingy<T> {
    x: T
}

impl<T:ToStr> ToStr for PolymorphicThingy<T> {
    fn to_str(&self) -> ~str {
        self.x.to_str()
    }
}

pub fn main() {
    println!("{}", Thingy { x: 1, y: 2 }.to_str());
    println!("{}", PolymorphicThingy { x: Thingy { x: 1, y: 2 } }.to_str());
}