// core::array
impl<T, const N: usize> [T; N] {
    pub const fn map<F, U>(self, f: F) -> [U; N]
    where
        F: [const] FnMut(T) -> U + [const] Destruct,
        U: [const] Destruct;
}

pub const fn from_fn<T: [const] Destruct, const N: usize, F>(f: F) -> [T; N]
where
    F: [const] FnMut(usize) -> T + [const] Destruct;