rust/tests/ui/regions/regions-reborrow-from-shorter-mut-ref.rs
2023-01-11 09:32:08 +00:00

17 lines
446 B
Rust

// Issue #8624. Tests that reborrowing the contents of an `&'b mut`
// pointer which is backed by another `&'a mut` can only be done
// for `'a` (which must be a sublifetime of `'b`).
fn copy_borrowed_ptr<'a, 'b>(p: &'a mut &'b mut isize) -> &'b mut isize {
&mut **p
//~^ ERROR lifetime may not live long enough
}
fn main() {
let mut x = 1;
let mut y = &mut x;
let z = copy_borrowed_ptr(&mut y);
*y += 1;
*z += 1;
}