1 error: Undefined Behavior: not granting access to tag <TAG> because that would remove [SharedReadOnly for <TAG>] which is strongly protected because it is an argument of call ID
2 --> $DIR/aliasing_mut4.rs:LL:CC
4 LL | pub fn safe(_x: &i32, _y: &mut Cell<i32>) {}
5 | ^^ not granting access to tag <TAG> because that would remove [SharedReadOnly for <TAG>] which is strongly protected because it is an argument of call ID
7 = help: this indicates a potential bug in the program: it performed an invalid operation, but the Stacked Borrows rules it violated are still experimental
8 = help: see https://github.com/rust-lang/unsafe-code-guidelines/blob/master/wip/stacked-borrows.md for further information
9 help: <TAG> was created by a Unique retag at offsets [0x0..0x4]
10 --> $DIR/aliasing_mut4.rs:LL:CC
12 LL | let xref = &mut x;
14 help: <TAG> is this argument
15 --> $DIR/aliasing_mut4.rs:LL:CC
17 LL | pub fn safe(_x: &i32, _y: &mut Cell<i32>) {}
20 = note: inside `safe` at $DIR/aliasing_mut4.rs:LL:CC
21 note: inside `main` at $DIR/aliasing_mut4.rs:LL:CC
22 --> $DIR/aliasing_mut4.rs:LL:CC
24 LL | safe_raw(xshr, xraw as *mut _);
25 | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
27 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
29 error: aborting due to previous error