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define-module + let-syntax + load ?


i'm trying to have Guile be able to load a file w/ some syntax
extensions w/ code similar to:

(define-module (some place))
(define-public (load-special-file filename)
  (let-syntax
    ((a (syntax-rules () (...)))
     (b (syntax-rules () (...)))
     ...)

    (load filename)))

unfortunately, this doesn't work.  after looking at boot-9.scm, i tried
`basic-load', but that didn't work either.  in both cases, the error
"unbound variable: a" occurs.

when everything is done at the top level (using `define-syntax' and
`define' w/o `define-module'), things seem to work fine.

my conclusion is that this approach must have some fundamental flaw due
to lack of understanding of fine-detail interaction between the (current)
module system, loading and syntactic extension.  can anyone suggest a
better approach?

thanks,
thi