This is "bad syntax" for the same reason that `(map or '())` is "bad
syntax".
When the macro expander sees `(map y-coord points)`, it recognizes `map` as
a variable binding and then tries expanding each argument to `map`.
Expanding `y-coord` by itself leads to the error.
You could instead define `y-coord` as an identifier macro or just alias it
as a function. (As Daniel & Jos recommend.)
(define-syntax (y-coord stx) ;; Identifier macro
(syntax-case stx ()
[y-coord:id #'point-y]))
(define y-coord point-y) ;; Function
For details on the expander:
http://docs.racket-lang.org/reference/syntax-model.html#%28part._expand-steps%29
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