+ eval_val, /* Value computed */
+ eval_formal, /* Formal computed */
+ eval_exec, /* Start a lambda evaluation */
+ eval_cond, /* Start next cond clause */
+ eval_cond_test, /* Check cond condition */
+ eval_progn, /* Start next progn entry */
+ eval_while, /* Start while condition */
+ eval_while_test, /* Check while condition */
+ eval_macro, /* Finished with macro generation */