rust/tests/ui/assign-assign.rs

// run-pass
// Issue 483 - Assignment expressions result in nil

fn test_assign() {
    let mut x: isize;
    let y: () = x = 10;
    assert_eq!(x, 10);
    assert_eq!(y, ());
    let mut z: () = x = 11;
    assert_eq!(x, 11);
    assert_eq!(z, ());
    z = x = 12;
    assert_eq!(x, 12);
    assert_eq!(z, ());
}

fn test_assign_op() {
    let mut x: isize = 0;
    let y: () = x += 10;
    assert_eq!(x, 10);
    assert_eq!(y, ());
    let mut z: () = x += 11;
    assert_eq!(x, 21);
    assert_eq!(z, ());
    z = x += 12;
    assert_eq!(x, 33);
    assert_eq!(z, ());
}

pub fn main() { test_assign(); test_assign_op(); }