| // 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. |
| |
| // run-pass |
| #![allow(unused_variables)] |
| |
| 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]; |
| } |
