clojure - 无法获取宏的值(clojure)

Question

在这一段clojure代码中:

(defn makeStructs ;line 27
 "open fName as a file and turns each line into a struct. Returns a Vector of structs"
 [fName]
   with-open[r (reader (file fName))]
   (let [r 
      res (doall (map makeStruct (line-seq r)))
      ]    
  (. r close)
     res
  ) 
)

我收到此编译器错误:

Exception in thread "main" java.lang.Exception: Can't take value of a macro: #'clojure.core/with-open (clojureHW.clj:27)

上面注释了第 27 行。

知道问题是什么吗？

Answer 1

你需要实际调用宏，

(defn makeStructs ;line 27
 "..."
 [fName]
   (with-open ; note the extra paren