You had:
(defmacro eval-cached [obj]
(when-not (contains? @cache obj)
(reset! cache (assoc @cache obj (eval obj))))
(@cache obj))
and:
(eval-cached fbody)
This results in eval-cached being called with obj bound to the symbol
'fbody rather than to the second argument to def-cached -- probably
not what you intended. It checks the cache for containing a value at
the key 'fbody, fails, and so goes to create the entry -- and calls
(eval 'fbody), rather than (eval the-code-you-passed-to-def-cached).
You really did need a function and not a macro for eval-cached.
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