multi_cartesian_product of zero iterators should produce one empty Vec

[andersk]

One would expect

for v in (0..n).map(|_| &[0, 1]).multi_cartesian_product() {
    println!("{:?}", v);
}

to enumerate all {0, 1} vectors of length n. However, it fails when n == 0, printing no vectors instead of the expected single vector [].

[Philippe-Cholet]

Hi, thanks for bringing this issue to our attention.
I just wanted to say that it has finally been solved and the fix will be released in our next release 0.13.0.