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//@ [!borrow-check] skip
//@ [borrow-check] known-failure
// Some negative tests for borrow checking
// This succeeds
fn choose<'a, T>(b: bool, x: &'a mut T, y: &'a mut T) -> &'a mut T {
if b {
x
} else {
y
}
}
pub fn choose_test() {
let mut x = 0;
let mut y = 0;
let z = choose(true, &mut x, &mut y);
*z += 1;
assert!(*z == 1);
// drop(z)
assert!(x == 1);
assert!(y == 0);
assert!(*z == 1); // z is not valid anymore
}
fn choose_wrong<'a, 'b, T>(b: bool, x: &'a mut T, y: &'b mut T) -> &'a mut T {
if b {
x
} else {
y // Expected lifetime 'a
}
}
fn test_mut1(b: bool) {
let mut x = 0;
let mut y = 1;
let z = if b { &mut x } else { &mut y };
*z += 1;
assert!(x >= 0);
*z += 1; // z is not valid anymore
}
#[allow(unused_assignments)]
fn test_mut2(b: bool) {
let mut x = 0;
let mut y = 1;
let z = if b { &x } else { &y };
x += 1;
assert!(*z == 0); // z is not valid anymore
}
fn test_move1<T>(x: T) -> T {
let _ = x;
return x; // x has been moved
}
pub fn refs_test1() {
let mut x = 0;
let mut px = &mut x;
let ppx = &mut px;
**ppx = 1;
assert!(x == 1);
assert!(**ppx == 1); // ppx has ended
}
pub fn refs_test2() {
let mut x = 0;
let mut y = 1;
let mut px = &mut x;
let py = &mut y;
let ppx = &mut px;
*ppx = py;
**ppx = 2;
assert!(*px == 2);
assert!(x == 0);
assert!(*py == 2);
assert!(y == 2);
assert!(**ppx == 2); // ppx has ended
}
pub fn test_box1() {
use std::ops::Deref;
use std::ops::DerefMut;
let mut b: Box<i32> = Box::new(0);
let x0 = b.deref_mut();
*x0 = 1;
let x1 = b.deref();
assert!(*x1 == 1);
assert!(*x0 == 1); // x0 has ended
}
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