RefCell and &mut ~Trait strange syntax is required.

``` rust
use std::cell::RefCell;

trait Foo {}

impl Foo for () {}

fn main() {
    let foo: RefCell<~Foo> = RefCell::new(~() as ~Foo);
    let fooref: &mut Foo = *&mut *foo.borrow_mut();
    println!("{:?}", fooref);
}
```

Is this really required? Thanks Eridius for helping me get this to work.
