Creating a nested MaybeUninit array unnecessarily calls memset

[abgros]

This function calls memset:

fn create_uninit_array() -> [[MaybeUninit<u8>; 4]; 200] {
    [[MaybeUninit::<u8>::uninit(); 4]; 200]
}

and this one doesn't:

fn create_uninit_array_fast() -> [MaybeUninit<u8>; 800] {
    [MaybeUninit::<u8>::uninit(); 800]
}

I would have expected the same assembly to be generated for both cases.

See on Godbolt