```rust
struct A<const N: usize> {
    data: [u8; N]
}

impl<const N: usize> A<N> {
    const _ASSERT: () = assert!(N.is_power_of_two());
}

fn main() {
    let b: A<3> = A { data: [0; 3] };
    println!("b.data={:?}", b.data);
}
```

Why does this assert not work the way I think it does? 🤔