| // Copyright 2014 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. |
| |
| // Assert that `mut self` on an immediate value doesn't |
| // allow mutating the original - issue #10615. |
| |
| |
| #[derive(Copy, Clone)] |
| struct Value { |
| n: isize |
| } |
| |
| impl Value { |
| fn squared(mut self) -> Value { |
| self.n *= self.n; |
| self |
| } |
| } |
| |
| pub fn main() { |
| let x = Value { n: 3 }; |
| let y = x.squared(); |
| assert_eq!(x.n, 3); |
| assert_eq!(y.n, 9); |
| } |
