Method eval

src/chap11/EnvOptimizer.java:51–53

(Environment env)

            size = lookup(syms, parameters(), body());
        }
        public Object eval(Environment env) {
            return new OptFunction(parameters(), body(), env, size);
        }
        public static int lookup(Symbols syms, ParameterList params,
                                 BlockStmnt body)
        {