PowerLoom 3.0.2.beta and SBCL 0.8.8

Hi Paul,

we haven't yet played with SBCL, so it is not surprising that there
were some startup problems.  We'll look at your changes and try to
incorporate them into future releases.  My suspicion is that the problem
with the PowerLoom demo #1 you experienced is also due to the
different Lisp, since it works without problems in all the Lisp
dialects we are using here (ACL, MCL and CMUCL) as well as in the Java
and C++ versions.  Since you are using PowerLoom on the Mac, you might
want to send mail to Tom Russ directly who is an avid Mac user and is
running PowerLoom on his Mac without any problems (using OpenMCL - I
think).  If you could send us (not to the list) a stack trace of the
error, then that would help also.

Hans

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> ....

> Unfortunately, attempting to run demo #1 reveals that there are still 
> some issues in the port. To aid in tracking them down, I've extended 
> the %%print-exception-context and %%get-exception-message functions to 
> support SBCL and accomodate the type-error case, which is the condition 
> I'm encountering, and one that is amenable to examining in an 
> ANSI-portable way, thanks to type-error-datum and 
> type-error-expected-type.

> So finally we arrive at the problem; at a certain point in the demo, a 
> type-error with datum NULL-VALUE and expected-type INSTANCE is being 
> thrown. From a visual examination of the code, it would appear that 
> NULL-VALUE is indeed null, which is indeed neither a CLOS instance nor 
> a PowerLoom instance. Any advice here would be most welcome.

> In the event that it would be desirable to support SBCL 0.8.8, I'm 
> attaching my (very small) diffs to the PowerLoom 3.0.2.beta sources 
> here.

> Many thanks and best regards,
> Paul Snively