Re: Using empty_string as the only "" string

[Miles Bader]

address@hidden (Johan Bockgård) writes:
>> I disagree.  I don't think most people expect much one way or the other
>> in this case, _especially_ because we're talking about lexical constants
>> (for instance, I expect very few people would be surprised if the
>> compiler merged various lexical constants).
>
> How about this then?
>
>         (let ((s1 (concat "ab" "c"))
>               (s2 (concat "a" "bc")))
>           (eq s1 s2)))))
..
> ** Prevent byte compiler from causing spurious string sharing
> when it optimizes away calls to functions such as concat.

S1 and S2 are not lexical constants -- and more importantly, the
`concat' function makes a specific guarantee that it will always return
a new string.

-Miles

-- 
`There are more things in heaven and earth, Horatio,
 Than are dreamt of in your philosophy.'