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error: Undefined Behavior: trying to retag from <TAG> for SharedReadOnly permission at ALLOC[0x4], but that tag does not exist in the borrow stack for this location
--> tests/fail/stacked_borrows/zst_slice.rs:LL:CC
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LL | assert_eq!(*s.as_ptr().add(1), 2);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ this error occurs as part of retag at ALLOC[0x4..0x8]
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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> would have been created here, but this is a zero-size retag ([0x0..0x0]) so the tag in question does not exist anywhere
--> tests/fail/stacked_borrows/zst_slice.rs:LL:CC
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LL | assert_eq!(*s.as_ptr().add(1), 2);
| ^^^^^^^^^^
= note: BACKTRACE (of the first span):
= note: inside `main` at RUSTLIB/core/src/macros/mod.rs:LL:CC
= note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
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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