| // 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. |
| |
| // Tests that two closures can simultaneously have immutable |
| // access to the variable, whether that immutable access be used |
| // for direct reads or for taking immutable ref. Also check |
| // that the main function can read the variable too while |
| // the closures are in scope. Issue #6801. |
| |
| |
| fn a() -> i32 { |
| let mut x = 3; |
| x += 1; |
| let c1 = || x * 4; |
| let c2 = || x * 5; |
| c1() * c2() * x |
| } |
| |
| fn get(x: &i32) -> i32 { |
| *x * 4 |
| } |
| |
| fn b() -> i32 { |
| let mut x = 3; |
| x += 1; |
| let c1 = || get(&x); |
| let c2 = || get(&x); |
| c1() * c2() * x |
| } |
| |
| fn c() -> i32 { |
| let mut x = 3; |
| x += 1; |
| let c1 = || x * 5; |
| let c2 = || get(&x); |
| c1() * c2() * x |
| } |
| |
| pub fn main() { |
| assert_eq!(a(), 1280); |
| assert_eq!(b(), 1024); |
| assert_eq!(c(), 1280); |
| } |