// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

trait Nat {
    const VALUE: usize;
}

struct Zero;
struct Succ<N>(N);

impl Nat for Zero {
    const VALUE: usize = 0;
}

impl<N: Nat> Nat for Succ<N> {
    const VALUE: usize = N::VALUE + 1;
}

fn main() {
    let x: [i32; <Succ<Succ<Succ<Succ<Zero>>>>>::VALUE] = [1, 2, 3, 4];
}