Re: Compiled COMPILE forms at load time Bug

* 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.

> 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.

Helmut