Function application

When writing compilers pattern matching is incredibly useful. Dan & Will both recommend supporting function application.

(defn parse [expr]
  (match [expr]
    [['if (test :> parse) (then :> parse) (else :> parse)]]
    {:op :if :test test :then then :else else}))

A match-syntax macro could probably be a lot cleaner:

(defn parse [expr]
  (match-syntax expr
    (if ~(test :> parse) ~(then :> parse) ~(else :> parse))
    {:op :if :test test :then then :else else}))