Re: Announcing RMCL

On May 27, 2009, at 11:32 AM, Brian Mastenbrook wrote:

> On May 27, 2009, at 1:20 PM, Terje Norderhaug wrote:
>
>>
>> On May 27, 2009, at 9:34 AM, Andrew Shalit wrote:
>>> Dear MCL Users -
>>>
>>> I'm happy to announce the immediate availability of RMCL, a version
>>> of
>>> Macintosh Common Lisp (MCL) that runs under Rosetta on Mac OS X
>>> version 10.5 using Intel hardware.
>>
>> Fantastic! I am very excited about its prospects.
>
>
> Don't get your hopes up too much.

Indeed.  I've already found one serious bug:


Welcome to Macintosh Common Lisp Version 5.1b1!
? (defclass a () ())
#<STANDARD-CLASS A>
? (defmethod m ((a a)) 'a)
#<STANDARD-METHOD M (A)>
? (defclass b () ())
#<STANDARD-CLASS B>
? (m (make-instance 'b))
 > Error: No applicable method for args:
 >         (#<B #x14D166E>)
 >        to #<STANDARD-GENERIC-FUNCTION M #x14CFBD6>
 > While executing: #<CCL::STANDARD-KERNEL-METHOD NO-APPLICABLE-METHOD  
(T)>
 > Type Command-. to abort.
See the Restarts… menu item for further choices.
1 >
Aborted
? (defclass b (a) ())
#<STANDARD-CLASS B>
? (m (make-instance 'b))
 > Error: No applicable method for args:
 >         (#<B #x14D639E>)
 >        to #<STANDARD-GENERIC-FUNCTION M #x14CFBD6>
 > While executing: #<CCL::STANDARD-KERNEL-METHOD NO-APPLICABLE-METHOD  
(T)>
 > Type Command-. to abort.
See the Restarts… menu item for further choices.
1 >

Apparently, the applicable method cache is not being reset when an  
class is redefined.  The bug shows up the other way too:

? (defclass c (a) ())
#<STANDARD-CLASS C>
? (m (make-instance 'c))
A
? (defclass c () ())
#<STANDARD-CLASS C>
? (m (make-instance 'c))
A
? (find-method #'m () (list (find-class 'c)))
 > Error: #<STANDARD-GENERIC-FUNCTION M #x14CFBD6> has no method for  
NIL (#<STANDARD-CLASS C>)
 > While executing: #<CCL::STANDARD-KERNEL-METHOD FIND-METHOD  
(STANDARD-GENERIC-FUNCTION T T)>
 > Type Command-. to abort.
See the Restarts… menu item for further choices.
1 >


I was about ready to give RMCL a big woo-hoo, but not being able to  
redefine classes is a show-stopper for me.

rg

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