Re: Compiled COMPILE forms at load time Bug

On 3/16/10 7:17 AM, Helmut Eller wrote:
> * Raymond Toy [2010-03-16 04:41+0100] writes:
>
>   
>> I tried undefine-function-name instead of undefine-structure. It works,
>> but having a redefined structure accessor that doesn't really work is a
>> problem.  For example,
>>
>> (defstruct abc a)
>> (defun abc-a (x) 42)
>> (make-abc :a 'a) -> #S(abc :a 42)
>>
>> This seems not good either.   
>>     
> default-structure-print calls (fdefinition (dsd-accessor slot)).  We
> could change that to %instance-ref.  That would also help in this case:
>
> (defstruct abc a)
> (fmakunbound 'abc-a)
> (make-abc :a 'a) -> error during printing
>
> Unfortunately, there are other places that call dsd-accessor by name.
> Like inspect.
>   
Is there any reason why we couldn't replace at least these two places by
%instance-ref?
>   
>> Maybe disallowing redefining
>> structure-accessors this way is the best; don't kill the structure,
>> don't allow redefinition of the accessor either.
>>     
> Sounds like a candidate for cerror.
>   
I did that already last night, just to see if did what I wanted.  Seems
to work.

Ray