hi,

> why does clojure want to cast the result to IFn?
>

if I parse that correctly, you have two parens around the let-expression.  
That leads to Clojure evaluating the let-expression, taking the result 
(which is the return value of the line you mentioned: a Boolean) and trying 
to call that as a function.

Consider:

 user=> ((let [x :dont-care] +) 3 4)
 7

Hope, this helps.

Stefan

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