Do array literals still always allocate?

[Nicholas Wilson via Digitalmars-d-learn]

On Saturday, 13 May 2017 at 18:32:16 UTC, Lewis wrote:
> import std.random;
> import std.stdio;
>
> int[4] testfunc(int num) @nogc
> {
>     return [0, 1, num, 3];
> }
>
> int main()
> {
>     int[4] arr = testfunc(uniform(0, 15));
>     writeln(arr);
>     return 0;
> }
>
> I've read a bunch of stuff that seems to indicate that array 
> literals are always heap-allocated, even when being used to 
> populate a static array. However, testfunc() above compiles as 
> @nogc. This would indicate to me that D does the smart thing 
> and avoids a heap allocation for an array literal being used to 
> populate a static array. Is all the old stuff I was reading 
> just out-of-date now?

1D arrays it doesn't, 2D or higher it does.