#![feature(generic_const_exprs)]
pub const fn assert_zero(x: usize) -> usize {
    if x != 0 {
        panic!("expected zero");
    } else {
        0
    }
}

pub fn chunked<const C: usize, const N: usize, T>(x: [T; N]) -> [[T; C]; N / C]
where
    [(); assert_zero(N % C)]:,
{
    unsafe {
        core::mem::ManuallyDrop::new(x)
            .as_ptr()
            .cast::<[[T; C]; N / C]>()
            .read()
    }
}