bug#12096: 24.1; Several documented functions in URL package are not defined

[Stefan Monnier]

>> This does not remove a useless constructor, but instead adds a useless
>> contructor (the ":constructor nil" thingy is there to disable the
>> automatic creation of a default constructor).

> Are you sure?

Yes.  Try it.

> (progn
>   (require 'cl)
>   (fmakunbound 'make-foo)
>   (fmakunbound 'cake)
>   (defstruct (foo (:constructor cake)) a b c)
>   (mapcar 'fboundp '(make-foo cake)))

There's a difference between (:constructor cake) and (:constructor cake
(foo bar)) where the first just gives the name to use for the default
constructor, whereas the second defines an additional constructor.


        Stefan