rust/src/test/run-pass/box-unbox.rs

type box[T] = {c: @T};

fn unbox[T](b: &box[T]) -> T { ret *b.c; }

fn main() {
    let foo: int = 17;
    let bfoo: box[int] = {c: @foo};
    log "see what's in our box";
    assert (unbox[int](bfoo) == foo);
}