fn* is a compiler intrinsic...it's pretty low-level, it doesn't
support destructuring,. So instead, core.clj creates a macro called fn
that adds all this other functionality and eventually spits out the
fn* in a format the compiler wants. Basically it's set up this way so
that you can write the majority of the functionality behind fn can be
written in clojure code instead of in Java.

Note: there are other forms that are the same as fn*. Namely, loop*,
and let*. They all exist for the same reasons.

Timothy

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