[R6RS] modules

Matthew Flatt mflatt
Mon Aug 23 08:40:34 EDT 2004

At Mon, 23 Aug 2004 00:41:49 -0500 (EST), "R. Kent Dybvig" wrote:
> > Also, given
> >   (module N (def-f-mac)
> >     (require M)
> >     (define-syntax def-f-mac
> >       (lambda (stx) 
> >         #'(define-syntax f (lambda (stx) x)))))
> > every use of the macro `def-f-mac' would lead to a syntax error, right?
> Right.

Good --- so far I understand. But how about

  (module M (x get-x)
    (require M)
    (define x 5)
    (define (get-x) #'x))

  (module N (def-f-fun def-f-mac)
    (require only-for-syntax M)
    (define-syntax def-f-mac 
      (lambda (stx) 
        (with-syntax ((x2 (get-x)))
          #'(define-syntax f (lambda (stx) x2)))))
    (define-syntax def-f-fun
      (lambda (stx) 
        (with-syntax ((x2 (get-x)))
          #'(define f (lambda (stx) x2))))))

I expect that either `def-f-mac' or `def-f-fun' always works, and the
other never works. But which one (if either)?

[In the analogous MzScheme code, `def-f-mac' would work. ]


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