| error: Undefined Behavior: write access through <TAG> at ALLOC[0x0] is forbidden |
| --> tests/fail/tree_borrows/alternate-read-write.rs:LL:CC |
| | |
| LL | *y += 1; // Failure |
| | ^^^^^^^ Undefined Behavior occurred here |
| | |
| = help: this indicates a potential bug in the program: it performed an invalid operation, but the Tree Borrows rules it violated are still experimental |
| = help: see https://github.com/rust-lang/unsafe-code-guidelines/blob/master/wip/tree-borrows.md for further information |
| = help: the accessed tag <TAG> has state Frozen which forbids this child write access |
| help: the accessed tag <TAG> was created here, in the initial state Reserved |
| --> tests/fail/tree_borrows/alternate-read-write.rs:LL:CC |
| | |
| LL | let y = unsafe { &mut *(x as *mut u8) }; |
| | ^^^^^^^^^^^^^^^^^^^^ |
| help: the accessed tag <TAG> later transitioned to Unique due to a child write access at offsets [0x0..0x1] |
| --> tests/fail/tree_borrows/alternate-read-write.rs:LL:CC |
| | |
| LL | *y += 1; // Success |
| | ^^^^^^^ |
| = help: this transition corresponds to the first write to a 2-phase borrowed mutable reference |
| help: the accessed tag <TAG> later transitioned to Frozen due to a foreign read access at offsets [0x0..0x1] |
| --> tests/fail/tree_borrows/alternate-read-write.rs:LL:CC |
| | |
| LL | let _val = *x; |
| | ^^ |
| = help: this transition corresponds to a loss of write permissions |
| = note: BACKTRACE (of the first span): |
| = note: inside `main` at tests/fail/tree_borrows/alternate-read-write.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 |
| |
