[:] as empty associative array literal, plus warning for null

[deadalnix]

On Thursday, 4 July 2013 at 14:45:57 UTC, TommiT wrote:
> On Thursday, 4 July 2013 at 13:32:25 UTC, Steven Schveighoffer 
> wrote:
>> On Thu, 04 Jul 2013 08:52:12 -0400, Regan Heath wrote:
>>> Indeed.  IMO if(arr) should mean if(arr.ptr) .. and I thought 
>>> it did.. or did this change at some point?
>>
>> No, it should mean if(arr.length).  It means if(arr.ptr) now, 
>> and this is incorrect.  [..]
>
> The meaning of if(x) for all x of nullable types has always 
> been if(x != null) probably in all languages.

D has differentiated values and identity.