rust/tests/ui/borrowck/borrowck-assign-to-andmut-in-borrowed-loc.rs
2023-01-11 09:32:08 +00:00

24 lines
541 B
Rust

// Test that assignments to an `&mut` pointer which is found in a
// borrowed (but otherwise non-aliasable) location is illegal.
struct S<'a> {
pointer: &'a mut isize
}
fn copy_borrowed_ptr<'a>(p: &'a mut S<'a>) -> S<'a> {
S { pointer: &mut *p.pointer }
}
fn main() {
let mut x = 1;
{
let mut y = S { pointer: &mut x };
let z = copy_borrowed_ptr(&mut y);
*y.pointer += 1;
//~^ ERROR cannot use `*y.pointer`
//~| ERROR cannot assign to `*y.pointer`
*z.pointer += 1;
}
}