I tried cond-expand, just to see if it worked and no
the export clause does not fall through and the symbols are not exported.

I can fix this as you say by using the new interface syntax-parameter
interface
but I'm curious how to be ably to conditionally export symbols depending on
the
guile-version!

/Stefan

On Thu, May 17, 2012 at 10:20 AM, Andy Wingo <wingo@pobox.com> wrote:

> On Wed 16 May 2012 23:32, Stefan Israelsson Tampe <stefan.itampe@gmail.com>
> writes:
>
> > (define-syntax guile-stuff
> >   (lambda (x)
> >     (syntax-case x ()
> >       (_
> >        (let ((q (ver)))
> >          (cond
> >           ((eq? q 'v2.0)
> >            #'(begin 1))
> >           ((eq? q 'v2.1)
> >            #'(begin
> >                (define-syntax-rule (fluid-let-syntax . l)
> >                  (syntax-parametrize . l))
> >                (export fluid-let-syntax)))
> >           (else (error "not supported version"))))))))
>
> Here the macro introduces a new identifier, fluid-let-syntax.  But its
> context is not that of the (guile-stuff) expression.  If you did
> (datum->syntax 'fluid-let-syntax x) that might work.
>
> In general cond-expand is better.  I just added a guile-2.2 feature on
> master.  Use that instead.
>
> But in this case, better to just change both versions to use
> syntax-parameterize :)
>
> Andy
> --
> http://wingolog.org/
>