Re: Using empty_string as the only "" string

[David Kastrup]

Andreas Schwab <address@hidden> writes:

> "Juanma Barranquero" <address@hidden> writes:
>
>> On 4/24/07, Andreas Schwab <address@hidden> wrote:
>>
>>> I see nothing wrong with that.
>>
>> I do see it. The issue is not string comparison, but object identity.
>> It's no different from
>>
>> (eq 0.0 0.0) => nil
>>
>> I would be mightily surprised if
>>
>>  (eq (- 2.0 0.0) (- 2.0 0.0)) => nil
>>  (eq (- 2.0 1.0) (- 2.0 1.0)) => nil
>>  (eq (- 2.0 2.0) (- 2.0 2.0)) => t
>>
>> were true.
>
> In which way is this different from
>
>    (eq (cdr '(a)) (cdr '(b))) => t

'(a) is (cons 'a nil), '(b) is (cons 'b nil),
so indeed the cdr of both lists is the identically same value.  Lists
are _identically_ grounded.

-- 
David Kastrup, Kriemhildstr. 15, 44793 Bochum