1 error: Undefined Behavior: attempting a write access using <TAG> at ALLOC[0x0], but that tag does not exist in the borrow stack for this location
2 --> $DIR/box_exclusive_violation1.rs:LL:CC
7 | attempting a write access using <TAG> at ALLOC[0x0], but that tag does not exist in the borrow stack for this location
8 | this error occurs as part of an access at ALLOC[0x0..0x4]
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> was created by a SharedReadOnly retag at offsets [0x0..0x4]
13 --> $DIR/box_exclusive_violation1.rs:LL:CC
15 LL | LEAK = x as *const _ as *mut _;
17 help: <TAG> was later invalidated at offsets [0x0..0x4] by a write access
18 --> $DIR/box_exclusive_violation1.rs:LL:CC
23 = note: inside `unknown_code_2` at $DIR/box_exclusive_violation1.rs:LL:CC
24 note: inside `demo_box_advanced_unique` at $DIR/box_exclusive_violation1.rs:LL:CC
25 --> $DIR/box_exclusive_violation1.rs:LL:CC
27 LL | unknown_code_2();
29 note: inside `main` at $DIR/box_exclusive_violation1.rs:LL:CC
30 --> $DIR/box_exclusive_violation1.rs:LL:CC
32 LL | demo_box_advanced_unique(Box::new(0));
33 | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
35 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
37 error: aborting due to previous error