You're not implementing IFn.applyTo, you should.

Why applyTo is used in the second example while invoke is used in the
other cases has to do with implementation details of how def expressions
are compiled/evaluated.

Alexey Cherkaev writes:

> Hi,
>
> I have encountered the problem with Clojure 1.6.0, when I create the record
> that implements IFn.
>
> For example,
>
> (defrecord Foo [x]
>     clojure.lang.IFn
>     (invoke [_ f] (f x)))
>
> Than create an instance of this record:
>
> (def f (->Foo 10))
>
> And we can call it without a problem:
>
> user=> (f inc)
> 11
>
> Yet, if you try to define a value to keep the result, compiler throws an
> error:
>
> user=> (def z (f inc))
>
> CompilerException java.lang.AbstractMethodError,
> compiling:(form-init4774307052978984831.clj:1:8)
>
> There is workaround: create local binding first and then assign the value
> to a global variable:
>
> user=> (def z (let [temp (f inc)] temp))
> #'user/z
> user=> z
> 11
>
> Is this a bug or I don't fully understand why you can't do that?
>
> Cheers, Alexey

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