mirror of https://github.com/rust-lang/rust
26 lines
654 B
Rust
26 lines
654 B
Rust
// Test that assignments to an `&mut` pointer which is found in a
|
|
// borrowed (but otherwise non-aliasable) location is illegal.
|
|
|
|
//@ compile-flags: -C overflow-checks=on
|
|
|
|
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` because it was mutably borrowed [E0503]
|
|
//~| ERROR cannot assign to `*y.pointer` because it is borrowed [E0506]
|
|
*z.pointer += 1;
|
|
}
|
|
}
|