I'll back this change out. I don't feel particularly attached to it.

However I'm certain that
  (let ((x :foo)) (unintern x))
violates
 "X3J13 voted in January 1989 <36> to clarify that it is an error to destructively modify any object that appears as a constant in executable code, whether within a /quote/ special form or as a self-evaluating form"

Changing the 'symbol-package' to nil would be forbidden.
  


On Tue, Jun 24, 2014 at 7:17 AM, Stas Boukarev <stassats@gmail.com> wrote:
Nikodemus Siivola <nikodemus@random-state.net> writes:

> On 24 June 2014 07:56, Stas Boukarev <stassats@gmail.com> wrote:
>
>> I don't think that it's totally different, before,
>> (let ((x (intern "x" :keyword))) (unintern x :keyword) (keywordp x))
>> returned NIL, now it returns T.
>
> I'm trying to decide if I think this is somehow different from
>
>   (let ((x :foo)) (unintern x) (keywordp x)) => T
It should be (unintern x :keyword), then it's NIL, since KEYWORDP isn't
foldable.
--
With best regards, Stas.

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