http://cmayes.wikispaces.com/PracticalClojure13: ...

> defrecord does not support Java class inheritance, so it cannot override 
> methods of Java classes, even abstract classes. However, it does permit you 
> to override methods of java.lang.Object such as hashCode, equals, and 
> toString. Simply include java.lang.Object in the defrecord as if it were an 
> interface. Clojure will generate good value-based implementations of the 
> hashCode and equals methods, so it is rarely necessary to implement them 
> yourself.
>

(defrecord R [x y] java.lang.Object (equals [_ r](= x(.x r))))
--> Duplicate method name&signature in class file

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