1 error: Undefined Behavior: not granting access to tag <TAG> because incompatible item [SharedReadOnly for <TAG>] is protected by call ID
2 --> $DIR/aliasing_mut2.rs:LL:CC
4 LL | pub fn safe(_x: &i32, _y: &mut i32) {}
5 | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not granting access to tag <TAG> because incompatible item [SharedReadOnly for <TAG>] is protected by 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_mut2.rs:LL:CC
12 LL | let xref = &mut x;
14 help: <TAG> cannot be used for memory access because that would remove protected tag <TAG>, protected by this function call
15 --> $DIR/aliasing_mut2.rs:LL:CC
17 LL | pub fn safe(_x: &i32, _y: &mut i32) {}
18 | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
19 help: <TAG> was derived from <TAG>, which in turn was created here
20 --> $DIR/aliasing_mut2.rs:LL:CC
22 LL | safe_raw(xshr, xraw);
25 = note: inside `safe` at $DIR/aliasing_mut2.rs:LL:CC
26 note: inside `main` at $DIR/aliasing_mut2.rs:LL:CC
27 --> $DIR/aliasing_mut2.rs:LL:CC
29 LL | safe_raw(xshr, xraw);
30 | ^^^^^^^^^^^^^^^^^^^^
32 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
34 error: aborting due to previous error