// run-pass

const HASH_LEN: usize = 20;
struct Hash(#[allow(unused_tuple_struct_fields)] [u8; HASH_LEN]);
fn init_hash(_: &mut [u8; HASH_LEN]) {}

fn foo<'a>() -> &'a () {
    Hash([0; HASH_LEN]);
    init_hash(&mut [0; HASH_LEN]);
    let (_array,) = ([0; HASH_LEN],);
    &()
}

fn main() {
    foo();
}