null Vs [] return arrays

[bearophile]

Kagamin:

> [] is not null, it's an array of 0 elements, what is done exactly.
> edx points to the allocated array.

I don't understand what you say. I think the caller of foo() and bar() receive the same thing, two empty registers. I think that cast(int[])null and cast(int[])[] are the same thing for D.

void main() {
    assert(cast(int[])null == cast(int[])null);
    auto a1 = cast(int[])null;
    a1 ~= 1;
    auto a2 = 1 ~ cast(int[])null;
}

Bye,
bearophile