-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
On 13-01-12 15:52, Sam Tobin-Hochstadt wrote:
> On Fri, Jan 13, 2012 at 9:23 AM, Matthias Felleisen
> <matth...@ccs.neu.edu> wrote:
>> compute the free variables with a simple recursive pass over core
>> syntax,
>
> Note that there's code to do this here:
> http://pre.racket-lang.org/docs/html/syntax/syntax-helpers.html
>
I'm having some trouble using this code. I would expect something like:
#lang racket
(require (for-syntax syntax/free-vars))
(define-syntax (depgraph stx)
(syntax-case stx ()
((_ ((id rule) ...))
(with-syntax (((dep ...) (free-vars (expand #'(rule ...)))))
#`((id . dep) ...)) )))
(define simple-arith
(depgraph
((a #f)
(b (* 3 a))
(c (+ 5 a b))
(d (let ((a 9)) (- c a))) )))
simple-arith
to work, but expand complains about the unbound a in the rule for b.
Marijn
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v2.0.18 (GNU/Linux)
Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/
iEYEARECAAYFAk8UHq8ACgkQp/VmCx0OL2wScwCdFaR7fSv9XF8eblXDaNMTO9Yo
fHsAnRDxwppSqljz2roh385i/mXhf7Ct
=y/4U
-----END PGP SIGNATURE-----
____________________
Racket Users list:
http://lists.racket-lang.org/users
