Consider the two definitions:

(defn if-let-good [str]
  (if-let [rest (seq (drop-while (partial = \a) str))]
    (first rest)
    "empty"))

(defn if-let-bad [seq]
  (if-let [rest (seq (drop-while (partial = \a) seq))]
    (first rest)
    "empty"))

The only difference between them is the name of the arg: "str" in the
good
definition, "seq" in the bad definition.

(if-let-good "")
=>  "empty"

(if-let-bad "")

aborts with:

java.lang.String cannot be cast to clojure.lang.IFn
  [Thrown class java.lang.ClassCastException]

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