FP for OO typo

gistfile1.clj

;Original function, p. 41 of FP for OO

user=> (def shift
         (fn [this xinc yinc]
           (Point (+ (x this) xinc)
                  (+ (y this) yinc))))
CompilerException java.lang.RuntimeException: Unable to resolve symbol: y in this context, compiling:(NO_SOURCE_PATH:1) 

;Updated function with correct :x :y key use
user=> (def shift
         (fn [this xinc yinc]
           (Point (+ (:x this) xinc)
                  (+ (:y this) yinc))))
#'user/shift
user=> (shift (Point 1 200) -1 -200)
{:x 0, :y 0, :__class_symbol__ Point}