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error: Undefined Behavior: trying to retag from <TAG> for SharedReadWrite permission at ALLOC[0x0], but that tag does not exist in the borrow stack for this location
--> tests/fail/box-cell-alias.rs:LL:CC
|
LL | unsafe { (*ptr).set(20) };
| ^^^^^^ this error occurs as part of retag at ALLOC[0x0..0x1]
|
= 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 SharedReadWrite retag at offsets [0x0..0x1]
--> tests/fail/box-cell-alias.rs:LL:CC
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LL | let ptr: *const Cell<u8> = &*val;
| ^^^^^
help: <TAG> was later invalidated at offsets [0x0..0x1] by a Unique retag
--> tests/fail/box-cell-alias.rs:LL:CC
|
LL | let res = helper(val, ptr);
| ^^^
= note: BACKTRACE (of the first span):
= note: inside `helper` at tests/fail/box-cell-alias.rs:LL:CC
note: inside `main`
--> tests/fail/box-cell-alias.rs:LL:CC
|
LL | let res = helper(val, ptr);
| ^^^^^^^^^^^^^^^^
note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
error: aborting due to 1 previous error
|
