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error: Undefined Behavior: not granting access to tag <TAG> because that would remove [SharedReadOnly for <TAG>] which is strongly protected
--> tests/fail/both_borrows/aliasing_mut4.rs:LL:CC
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LL | pub fn safe(x: &i32, y: &mut Cell<i32>) {
| ^ Undefined Behavior occurred here
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= help: this indicates a potential bug in the program: it performed an invalid operation, but the Stacked Borrows rules it violated are still experimental
= help: see https://github.com/rust-lang/unsafe-code-guidelines/blob/master/wip/stacked-borrows.md for further information
help: <TAG> was created by a Unique retag at offsets [0x0..0x4]
--> tests/fail/both_borrows/aliasing_mut4.rs:LL:CC
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LL | let xref = &mut x;
| ^^^^^^
help: <TAG> is this argument
--> tests/fail/both_borrows/aliasing_mut4.rs:LL:CC
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LL | pub fn safe(x: &i32, y: &mut Cell<i32>) {
| ^
= note: BACKTRACE (of the first span):
= note: inside `safe` at tests/fail/both_borrows/aliasing_mut4.rs:LL:CC
note: inside `main`
--> tests/fail/both_borrows/aliasing_mut4.rs:LL:CC
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LL | safe_raw(xshr, xraw as *mut _);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
error: aborting due to 1 previous error
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