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// 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: 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 freed when evaluating the second
// argument!
add(
&*a,
rewrite(&mut a)); //~ ERROR cannot borrow
}
fn explicit() {
let mut a: Box<_> = Box::new(1);
add(
&*a,
rewrite(&mut a)); //~ ERROR cannot borrow
}
fn main() {}
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