| error: Undefined Behavior: trying to retag from <TAG> for Unique permission at ALLOC[0x4], but that tag does not exist in the borrow stack for this location |
| --> $DIR/return_invalid_mut_option.rs:LL:CC |
| | |
| LL | ret |
| | ^^^ |
| | | |
| | trying to retag from <TAG> for Unique permission at ALLOC[0x4], but that tag does not exist in the borrow stack for this location |
| | this error occurs as part of retag (of a reference/box inside this compound value) at ALLOC[0x4..0x8] |
| | errors for retagging in fields are fairly new; please reach out to us (e.g. at <https://rust-lang.zulipchat.com/#narrow/stream/269128-miri>) if you find this error troubling |
| | |
| = 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 [0x4..0x8] |
| --> $DIR/return_invalid_mut_option.rs:LL:CC |
| | |
| LL | let ret = Some(ret); |
| | ^^^^^^^^^ |
| help: <TAG> was later invalidated at offsets [0x0..0x8] by a read access |
| --> $DIR/return_invalid_mut_option.rs:LL:CC |
| | |
| LL | let _val = unsafe { *xraw }; // invalidate xref |
| | ^^^^^ |
| = note: BACKTRACE (of the first span): |
| = note: inside `foo` at $DIR/return_invalid_mut_option.rs:LL:CC |
| note: inside `main` |
| --> $DIR/return_invalid_mut_option.rs:LL:CC |
| | |
| LL | match foo(&mut (1, 2)) { |
| | ^^^^^^^^^^^^^^^^ |
| |
| note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace |
| |
| error: aborting due to previous error |
| |
