Having a problem with an example (shift a point)

[Eyal Golan]

Hi,

I ran the following definitions in the REPL:

(def Point (fn [x y] {:x x :y y :__class_symbol__ 'Point}))

(def class-of :__class_symbol__)

Then I tried to set the shift method, as described in P.55 :

(def shift (fn [this xinc yinc] (Point (+ (x this) xinc) (+ (y this) yinc))))

I get the following exception in the REPL:

Syntax error compiling at (REPL:1:61).

Unable to resolve symbol: y in this context

I tried different ways, but always have the same problem.

What did I miss?

Thanks

[Brian Marick]

Sorry not to respond in any useful time.

The definition of `shift` assumes that you’ve defined the `x` and `y` functions as described at the end of the preceding section (3.2):

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