rem: Scheme_Object *l; l = list_exec(argc, argv, 0); scheme_make_list_immutable(l); return l;
add: return list_exec(argc, argv, 0, 1);
context: list_immutable_prim (int argc, Scheme_Object *argv[]){  Scheme_Object *l;  l = list_exec(argc, argv, 0);  scheme_make_list_immutable(l);  return l;}