The best way to merge multiple bit vectors?

[Anivie]

I am trying to merge multiple BitVecs, such that if a position has a 1 in one of the BitVecs, that position in the final set will store 1; if all the BitVecs have 0 in that position, the result will be 0. I am attempting to accomplish this task in the following way:

for each_class in mask {
    for all in mask_all.as_raw_mut_slice() {
        for current in each_class.mask.as_raw_slice() {
            *all |= *current;
        }
    }
}

But it doesn't seem to be working properly, how should I change it? This is the current version that works:

for each_class in mask {
    for (index, all) in each_class.mask.iter().enumerate() {
        if *all {
            mask_all.set(index, true);
        }
    }
}