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並前往https://stackoverflow.com/questions/24834116/how-can-i-get-clojure-pre-post-to-report-their-failing-value

How can I get Clojure :pre & :post to report their failing value?

You could wrap your predicate with the is macro from clojure.test (defn string-to-string [s1] {:pre [(is (string? s1))] :post [(is (string?

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