The non allocating D subset

[Adam D. Ruppe]

huh array literals don't work since they call an allocation 
function, even if all the data in them is all static. That's 
disappointing.

We can force it though with something like this:

template arrlit(T...) {
         static __gshared immutable int[] literal = [T];
         alias arrlit = literal;
}

         arr2 ~= arrlit!(1,2,3);

then it doesn't allocate (arr2 is a StackArray btw). The 
arrlit.ptr is the initialized data segment, which is a much more 
reasonable place for it than doing a runtime allocation.