You could (I think) simplify to:
(defmacro hmap [& kvs]
"Returns an immutable hashmap.
Keys must be compile-time constants."
(if (even? (count kvs))
(let [keys (into [] (take-nth 2) kvs)]
`(fn [k#]
(case k# ~@kvs ::keys ~keys)))
(throw (Exception. "hmap takes an EVEN number of args"))))
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