1 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
2 --> $DIR/pointer_smuggling.rs:LL:CC
4 LL | let _x = unsafe { *PTR };
7 | attempting a read 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..0x1]
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 SharedReadWrite retag at offsets [0x0..0x1]
13 --> $DIR/pointer_smuggling.rs:LL:CC
17 help: <TAG> was later invalidated at offsets [0x0..0x1] by a write access
18 --> $DIR/pointer_smuggling.rs:LL:CC
20 LL | *val = 2; // this invalidates any raw ptrs `fun1` might have created.
23 = note: inside `fun2` at $DIR/pointer_smuggling.rs:LL:CC
24 note: inside `main` at $DIR/pointer_smuggling.rs:LL:CC
25 --> $DIR/pointer_smuggling.rs:LL:CC
27 LL | fun2(); // if they now use a raw ptr they break our reference
30 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
32 error: aborting due to previous error