is the array literal in a loop stack or heap allocated?

[mw]

On Wednesday, 11 October 2023 at 03:15:30 UTC, H. S. Teoh wrote:
> On Wed, Oct 11, 2023 at 02:54:53AM +0000, mw via 
> Digitalmars-d-learn wrote:
>> Hi,
>> 
>> I want to confirm: in the following loop, is the array literal 
>> `a` vs. `b` stack or heap allocated? and how many times?
>> 
>> void main() {
>> 
>> int[2] a;
>
> This is stack-allocated. Once per call to the function.
>
>
>> int[] b;
>
> This is an empty slice. It can refer to either stack or heap 
> memory, depending on what's assigned to it.
>
>
>> int i;
>> While(++i <=100) {
>> 
>>   a = [i, i+1];  // array literal
>
> `a` is overwritten in-place once per loop.

How about the temporary array literal on the right hand side? 
It's stack / heap allocated? Or it's not in the language 
specification, but up to the (optimizing) compiler to decide?

>
>>   b = [i, i+1];
> [...]
>
> A new array consisting of 2 elements is allocated, once per 
> loop, and assigned to b each time. Any arrays from previous 
> iterations will be collected by the GC eventually.
>
>
> T