visiting vectors

gistfile1

    fn visit_evec_uniq(_mtbl: uint, _inner: *tydesc) -> bool {
        self.out += ~"~[";
        self.align_to::<~[u8]>();
        self.visit_unboxed_vec(_mtbl, _inner);
        self.bump_past::<~[u8]>();
        self.out += ~"]";
        true
    }

    fn visit_unboxed_vec(_mtbl: uint, _inner: *tydesc) -> bool {
        error!("visiting unboxed vec");
        let uvr: unboxed_vec_repr;
        unsafe {
            let p = *(self.ptr as *u8); // c_void is uncopiable
            uvr = *(p as *unboxed_vec_repr);
        }
        error!("%?", uvr);
        ...
    }