nest.rs

fn new_foo(a: &Path) -> Result<~Foo, ~str> {
    // any way to flatten this?
    do read_whole_file(a).map_move |b| {
        do frob(b).map_move |c| {
            do baz(c).map_move |d| {
                ~Foo { bar: d }
            }
        }
    }
}