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error: Undefined Behavior: attempting a read access using <TAG> at ALLOC[0x0], but that tag does not exist in the borrow stack for this location
--> tests/fail/stacked_borrows/illegal_read2.rs:LL:CC
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LL | let _val = *xref; // ...but any use of raw will invalidate our ref.
| ^^^^^ this error occurs as part of an access at ALLOC[0x0..0x4]
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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/stacked_borrows/illegal_read2.rs:LL:CC
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LL | let xref = unsafe { &mut *xraw }; // derived from raw, so using raw is still ok...
| ^^^^^^^^^^
help: <TAG> was later invalidated at offsets [0x0..0x4] by a SharedReadOnly retag
--> tests/fail/stacked_borrows/illegal_read2.rs:LL:CC
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LL | let shr = unsafe { &*xraw };
| ^^^^^^
= note: BACKTRACE (of the first span):
= note: inside `main` at tests/fail/stacked_borrows/illegal_read2.rs:LL:CC
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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