Re: [Sisc-users] Difference between 1.8.8 and 1.9.4 (bug?)

[Matthias R. <mat...@so...>]

Alessandro Colomba wrote:
> After upgrading from 1.8.8  to 1.9.4 I encountered a problem in my
> code that I eventually tracked down to a difference between these two
> sisc releases.
> 
> The snipped below produces two #t for 1.8.4 and two #f for 1.9.4. I
> believe the behavior in 1.8.4 to be the correct one.
> 
> --8<--8<--8<--8<--8<--8<--8<--
> (import oo)
> (import generic-procedures)
> 
> (define-generics :foo :bar)
> 
> (define-class (<foobar>)
>   (foo (value '())
>        (accessor :foo))
>   (bar (value '(1))
>        (accessor :bar)))
> 
> (define foobar (make <foobar>))
> 
> (display (null? (:foo foobar)))
> (display (equal? '(1) (:bar foobar)))
> --8<--8<--8<--8<--8<--8<--8<--

Alessandro,

this is definitely a bug. Thanks for reporting it. I have created bug 
report 1074510 for tracking purposes:
https://sourceforge.net/tracker/index.php?func=detail&aid=1074510&group_id=23735&atid=379534

It turns out to be a bug in quasiquote. Expect a fix and new release 
shortly.


Matthias.