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error: Undefined Behavior: trying to retag from <TAG> for SharedReadOnly permission at ALLOC[0x0], but that tag does not exist in the borrow stack for this location
--> tests/fail/both_borrows/aliasing_mut3.rs:LL:CC
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LL | pub fn safe(x: &mut i32, y: &i32) {
| ^ this error occurs as part of function-entry retag at ALLOC[0x0..0x4]
|
= 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 SharedReadOnly retag at offsets [0x0..0x4]
--> tests/fail/both_borrows/aliasing_mut3.rs:LL:CC
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LL | safe_raw(xraw, xshr);
| ^^^^
help: <TAG> was later invalidated at offsets [0x0..0x4] by a Unique function-entry retag inside this call
--> tests/fail/both_borrows/aliasing_mut3.rs:LL:CC
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LL | safe_raw(xraw, xshr);
| ^^^^^^^^^^^^^^^^^^^^
= note: BACKTRACE (of the first span):
= note: inside `safe` at tests/fail/both_borrows/aliasing_mut3.rs:LL:CC
note: inside `main`
--> tests/fail/both_borrows/aliasing_mut3.rs:LL:CC
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LL | safe_raw(xraw, xshr);
| ^^^^^^^^^^^^^^^^^^^^
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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