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

[bearophile]

> Telling apart the literal for an empty array from the literal 
> of a empty but not null array is a bad idea that muds the 
> language. And thankfully this currently fails:
>
> void main() {
>     int[] emptyArray = [];
>     assert(emptyArray !is null);
> }


But currently this code:

void main() {
     int[] emptyArray = [];
}


produces a call to __d_arrayliteralTX, for reasons unknown to me:


_D4temp10emptyArrayFZAi comdat
L0:     push    EAX
         mov EAX,offset FLAT:_D11TypeInfo_Ai6__initZ
         push    0
         push    EAX
         call    near ptr __d_arrayliteralTX
         mov EDX,EAX
         add ESP,8
         pop ECX
         xor EAX,EAX
         ret

Bye,
bearophile