'syntax-parameterize' is an *expression* form that takes a sequence of
internal definitions and a non-empty sequence of expressions---like
lambda. It requires a final expression, and it can't contain requires,
provides, etc.
You probably want 'splicing-syntax-parameterize' instead. It can be used
around top-level (or module-level) definitions as well as (IIRC)
requires and provides.
Ryan
On 02/26/2014 04:43 PM, antoine wrote:
Hello,
I would like to change the expansion of a given module.
I tested:
;; abc.rkt
#lang racket
(require racket/stxparam)
(define-syntax-parameter param-abc #f)
(define-syntax-rule (enable-abc body ...)
(#%plain-module-begin
(syntax-parameterize ([param-abc #t])
body ...)))
(provide (rename-out [enable-abc #%module-begin])
(except-out
(all-from-out racket)
#%module-begin))
;;edf.rkt
(module garage "abc.rkt"
(define (a) 1))
When i do a "raco expand edf.rkt" i get:
begin (possibly implicit): no expression after a sequence of internal
definitions
in: (begin (define-values (a) (lambda () 1)))
I have no idea by who this begin is introduced?
My ultimate goal is to change the expansion result of a module given some
parameters.
example:
(expand
(transform-the-list
(read (open-input-file "some-file.rkt"))
params))
where transform-the-list will transform something like '(module bla bla
(%module-begin ...)) into '(module bla bal (%module-begin (syntax-parameterize
(...) ...)))
But for now i am stick with the first problem :)
Thanks you.
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