Re: [Chicken-hackers] [PATCH] Fix for #989 and hopefully #877 too

[Jörg F. Wittenberger]

Am 06.11.2013 19:35, schrieb Peter Bex:
> On Wed, Nov 06, 2013 at 07:20:41PM +0100, "Jörg F. Wittenberger" wrote:
> > Now I ran a full recompile.  To the effect that some macro expansion has
> > been changed to the worse.
> >
> > It's somehow related to code, which uses Petrofsky extraction (replacing
> > some hon-hygienic macros I've been using before).  This used to compile
> > perfectly for several month.  Now it returns some #<unspecified>
> Have a look at whether your code uses letrec.  Its semantics changed
> recently to be more standards-correct.  The quick and dirty solution
> is to change all letrec uses to letrec*.
>
> This is changeset a647d9ed65f44df527e513464093447f56e24ead, I think.
>
> > which means that I have no working code at all anymore using chicken
> > more recent than July 23rd (my last "follow git").
> The change I mentioned is from August, so that makes sense.
>
> > Dunno what changed.  Its all so bad I could cry endlessly.
> Yeah, breaking changes like this suck :(

At the moment this is my favorite, where I'd bet things break:

(define-syntax define-transformer
  (syntax-rules ()
    ((_ transformer errloc body)
     (begin
       ;; (: name :render-renderer:)
       (define transformer (lambda-transformer errloc body))))))