1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
|
// Test that we detect nested calls that could free pointers evaluated
// for earlier arguments.
fn rewrite(v: &mut Box<usize>) -> usize {
*v = Box::new(22);
**v
}
fn add(v: &usize, w: Box<usize>) -> usize {
*v + *w
}
fn implicit() {
let mut a: Box<_> = Box::new(1);
// Note the danger here:
//
// the pointer for the first argument has already been
// evaluated, but it gets moved when evaluating the second
// argument!
add(
&*a,
a); //~ ERROR cannot move
}
fn explicit() {
let mut a: Box<_> = Box::new(1);
add(
&*a,
a); //~ ERROR cannot move
}
fn main() {}
|
