Why is null lowercase?

[Ali Çehreli]

On 01/25/2013 10:31 AM, Era Scarecrow wrote:
 > On Friday, 25 January 2013 at 14:43:01 UTC, Ali Çehreli wrote:
 >> On 01/25/2013 06:22 AM, Don wrote:
 >>> No, it's from 2002 (well, it was !==, renamed to !is in 2005).
 >>> Bearophile only joined us about the time D2 began, in late 2007.
 >>
 >> Ok. How about !in then? Did he lobby for that one? :)

 > //ummm feels like an AA. I'm sure if we used
 > //it it would become second nature.
 > if (ptr !in null)

Isn't that an error to apply the in operator to null? The expression 
above is syntactic sugar for the following one:

   !null.opBinaryRight!"in"(ptr))

Yes, there is also opBinary!"in" but it doesn't make sense to me to put 
the container on the left-hand side ever:

   if (myContainer in myElement)

Doesn't make sense.

 > After looking at all these 'in' should be reserved for array searching,
 > not pointer checking. It makes more sense to me that way.

Sorry if I implied otherwise. Yes, 'in' should be for that purpose. I 
merely tried to remember what syntax has been bearophile's strong 
suggestion. ;)

Ali