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|
──────────────────────────────────────────────────
Warning: this tree is indicative only. Some tags may have been hidden.
0.. 1
| Act | └─┬──<TAG=root of the allocation>
| ReIM| └─┬──<TAG=base>
| ReIM| ├─┬──<TAG=x>
| ReIM| │ └─┬──<TAG=caller:x>
| Res | │ └────<TAG=callee:x> Strongly protected
| ReIM| └────<TAG=y, callee:y, caller:y>
──────────────────────────────────────────────────
error: Undefined Behavior: write access through <TAG> (y, callee:y, caller:y) at ALLOC[0x0] is forbidden
--> tests/fail/tree_borrows/reserved/cell-protected-write.rs:LL:CC
|
LL | *y = 1;
| ^^^^^^ 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> (y, callee:y, caller:y) is foreign to the protected tag <TAG> (callee:x) (i.e., it is not a child)
= help: this foreign write access would cause the protected tag <TAG> (callee:x) (currently Reserved) to become Disabled
= help: protected tags must never be Disabled
help: the accessed tag <TAG> was created here
--> tests/fail/tree_borrows/reserved/cell-protected-write.rs:LL:CC
|
LL | let y = (&mut *n) as *mut UnsafeCell<_> as *mut _;
| ^^^^^^^^^
help: the protected tag <TAG> was created here, in the initial state Reserved
--> tests/fail/tree_borrows/reserved/cell-protected-write.rs:LL:CC
|
LL | unsafe fn write_second(x: &mut UnsafeCell<u8>, y: *mut u8) {
| ^
= note: BACKTRACE (of the first span):
= note: inside `main::write_second` at tests/fail/tree_borrows/reserved/cell-protected-write.rs:LL:CC
note: inside `main`
--> tests/fail/tree_borrows/reserved/cell-protected-write.rs:LL:CC
|
LL | write_second(x, y);
| ^^^^^^^^^^^^^^^^^^
note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
error: aborting due to 1 previous error
|
