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关于教程中Learn Clojure - Functions 一节中的习题,第四题的解答

clojure教程
clojure
#1
  1. Define a function do-nothing which takes a single argument x and returns it, unchanged.

(defn do-nothing [x] ___)
In Clojure, this is the identity function. By itself, identity is not very useful, but it is sometimes necessary when working with higher-order functions.

(source identity)

第四题的题目是这样的,似乎没有太看懂,

答案是这样的吗?
(defn do-nothing [x] x)