rust/src/test/run-pass/class-dtor.rs

struct cat {
  done : extern fn(uint),
  meows : uint,
}

impl cat : Drop {
    fn finalize(&self) {
        self.done(self.meows);
    }
}

fn cat(done: extern fn(uint)) -> cat {
    cat {
        meows: 0u,
        done: done
    }
}

fn main() {}