/* link fields in nodes, and nothing about the rest of the */
/* stack elements. Link fields hold an AO_t, which is not */
/* necessarily a real pointer. This converts the AO_t to a */
/* link fields in nodes, and nothing about the rest of the */
/* stack elements. Link fields hold an AO_t, which is not */
/* necessarily a real pointer. This converts the AO_t to a */