syntax-case and modules

It seems that a syntax-case macro cannot use a
function defined in the same module:

(module mod (mac1)
  
  (define (f x) x)
  
  (define-syntax mac1
    (lambda (syn)
      (syntax-case syn ()
        ((orig . args)
         (with-syntax
             ((res (datum->syntax-object
                    (syntax orig)
                    (apply f (syntax-object->datum
                              (syntax args))))))
           (syntax res))))))
)

#;> (load "tst.scm")
[error message]
Caused by Error: identifier out of context f

Outside a module, these two work.

I want the function to be defined *outside* the body
of the macro so that I can reuse it in another macro
(mac2).

Is this normal?

-- Dan

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