Re: [Kawa-commonlisp-dev] 'NIL != '()

[Jamison Hope]

On Aug 7, 2012, at 6:13 PM, Charles Turner wrote:

> Just remembered we had this conversation ages ago:
>
> Me>> I also noticed a weird bit of behaviour (noticed whilst  
> puzzling over
> > > why my PUSH wasn't working):
> > >
> > > #|kawa:4|# '(1 . ())
> > > (1)
> > > #|kawa:5|# '(1 . nil)
> > > (1 . nil)
> > > #|kawa:6|# (eq '() nil)
> > > t
> Jamison> I think that one is because (quote nil) is not currently  
> evaluating to
> > nil, as it should:
>
> Helmut> I think this is a reader issue: (eq 'nil '()) => #f
>
> Which is what I've just repeated... So do you think the solution is to
> special case a symbol called NIL in the reader? That seems to make
> redundant the symbol binding in EmptyNamespace (or CL package) to
> CommonLisp.FALSE, which concerns me.

Yeah, we need to have a special case for the symbol called NIL  
somewhere.
I'm not sure where the right place for that is.

--
Jamison Hope
The PTR Group
www.theptrgroup.com