How does/does fill() work at all ?

[pillowtrucker]

I was trying to generate some uuids and it seems that fill() just takes mutable references to temporary copies of the bytes in an array. I have to map the initial zeroed array and just use generate() to get it to work.

        let mut rng = nanorand::tls_rng();
        let random_bytes = [0; 16];
        let random_bytes = random_bytes.map(|_| rng.generate::<u8>());

the above works

        rng.fill(random_bytes);
        rng.fill_bytes(random_bytes);

the above two do nothing, regardless of the declared mutability of random_bytes