// 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 { } |