gistfile1.clj

(deftype MapProperty [^:volatile-mutable listeners ^:volatile-mutable value]
  ObservableValue
  (addListener [this listener]
    (set! listeners (conj listeners listener))
    nil))
    
;; fails with CompilerException java.lang.IllegalArgumentException: Must hint overloaded method: addListener


(deftype MapProperty [^:volatile-mutable listeners ^:volatile-mutable value]
  ObservableValue
  (addListener [this ^ChangeListener listener]
    (set! listeners (conj listeners listener))
    nil))
    
;; fails with CompilerException java.lang.IllegalArgumentException: Mismatched return type: addListener, expected: void, had: java.lang.Object


(deftype MapProperty [^:volatile-mutable listeners ^:volatile-mutable value]
  ObservableValue
  (addListener ^void [this ^ChangeListener listener]
    (set! listeners (conj listeners listener))
    nil))
    
;; fails with  Mismatched return type: addListener, expected: void, had: java.lang.Object