1 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
2 --> RUSTLIB/core/src/slice/mod.rs:LL:CC
4 LL | unsafe { &*index.get_unchecked(self) }
5 | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
7 | trying to retag from <TAG> for SharedReadOnly permission at ALLOC[0x4], but that tag does not exist in the borrow stack for this location
8 | this error occurs as part of retag at ALLOC[0x4..0x8]
10 = help: this indicates a potential bug in the program: it performed an invalid operation, but the Stacked Borrows rules it violated are still experimental
11 = help: see https://github.com/rust-lang/unsafe-code-guidelines/blob/master/wip/stacked-borrows.md for further information
12 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
13 --> $DIR/zst_slice.rs:LL:CC
15 LL | assert_eq!(*s.get_unchecked(1), 2);
18 = note: inside `core::slice::<impl [i32]>::get_unchecked::<usize>` at RUSTLIB/core/src/slice/mod.rs:LL:CC
19 note: inside `main` at $DIR/zst_slice.rs:LL:CC
20 --> $DIR/zst_slice.rs:LL:CC
22 LL | assert_eq!(*s.get_unchecked(1), 2);
25 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
27 error: aborting due to previous error