From: Eric Jiang <erji...@indiana.edu>
Subject: [Chicken-users] Internal defines broken when compiled?
Date: Fri, 4 Feb 2011 11:47:18 -0500
> Hi all,
> I wrote a procedure with several internal defines, and am running into
> problems with the compiled program. Running the compiled program
> gives an "unbound variable" error for a Chicken-generated variable.
>
> The following snippet reproduces the error:
>
> (define (x)
> (define (foo) (length bar))
> (define bar `(1 2 3 ,foo))
> (foo))
>
> (x) ;; should give 4
>
> However, this example works when interpreted in csi and petite. I
> searched the manual for some indication of whether this behavior in
> csc is documented, but did not turn up anything.
>
This is invalid Scheme code: the internal defines are converted
into a `letrec' form and in a `letrec', the right-hand-side expressions
may not refer directly to the bound variables:
(letrec ((foo ...)
(bar foo)) ; illegal
...)
(letrec ((foo ...)
(bar (lambda ... foo ...))) ; ok
...)
cheers,
felix
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