| // Copyright 2018 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. |
| |
| // compile-pass |
| #[derive(Copy, Clone, PartialEq, Eq)] |
| #[repr(packed)] |
| pub struct Num(u64); |
| |
| impl Num { |
| pub const ZERO: Self = Num(0); |
| } |
| |
| pub fn decrement(a: Num) -> Num { |
| match a { |
| Num::ZERO => Num::ZERO, |
| a => Num(a.0 - 1) |
| } |
| } |
| |
| fn main() { |
| } |
