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並前往https://blog.fogus.me/2009/12/21/clojures-pre-and-post/

Clojure's :pre and :post « Send More Paramedics - Fogus

But look like some case it is not working in clojure 1.5.1. (defn check-keyword [v] {:pre [keyword? v]} v). (defn check-nil [v] {:pre [nil?

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