| // 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. |
| |
| // Test that attempt to swap `&mut` pointer while pointee is borrowed |
| // yields an error. |
| // |
| // Example from src/librustc_borrowck/borrowck/README.md |
| |
| use std::mem::swap; |
| |
| |
| |
| fn foo<'a>(mut t0: &'a mut isize, |
| mut t1: &'a mut isize) { |
| let p: &isize = &*t0; // Freezes `*t0` |
| swap(&mut t0, &mut t1); //~ ERROR cannot borrow `t0` |
| *t1 = 22; |
| p.use_ref(); |
| } |
| |
| fn main() { |
| } |
| |
| trait Fake { fn use_mut(&mut self) { } fn use_ref(&self) { } } |
| impl<T> Fake for T { } |