| error: Undefined Behavior: read access through <TAG> (root of the allocation) is forbidden |
| --> $DIR/arg_inplace_observe_during.rs:LL:CC |
| | |
| LL | unsafe { ptr.read() }; |
| | ^^^^^^^^^^ read access through <TAG> (root of the allocation) is forbidden |
| | |
| = 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: the accessed tag <TAG> (root of the allocation) is foreign to the protected tag <TAG> (i.e., it is not a child) |
| = help: this foreign read access would cause the protected tag <TAG> (currently Active) to become Disabled |
| = help: protected tags must never be Disabled |
| help: the accessed tag <TAG> was created here |
| --> $DIR/arg_inplace_observe_during.rs:LL:CC |
| | |
| LL | / mir! { |
| LL | | let _unit: (); |
| LL | | { |
| LL | | let non_copy = S(42); |
| ... | |
| LL | | |
| LL | | } |
| | |_____^ |
| help: the protected tag <TAG> was created here, in the initial state Reserved |
| --> $DIR/arg_inplace_observe_during.rs:LL:CC |
| | |
| LL | x.0 = 0; |
| | ^^^^^^^ |
| help: the protected tag <TAG> later transitioned to Active due to a child write access at offsets [0x0..0x4] |
| --> $DIR/arg_inplace_observe_during.rs:LL:CC |
| | |
| LL | x.0 = 0; |
| | ^^^^^^^ |
| = help: this transition corresponds to the first write to a 2-phase borrowed mutable reference |
| = note: BACKTRACE (of the first span): |
| = note: inside `change_arg` at $DIR/arg_inplace_observe_during.rs:LL:CC |
| note: inside `main` |
| --> $DIR/arg_inplace_observe_during.rs:LL:CC |
| | |
| LL | Call(_unit = change_arg(Move(*ptr), ptr), ReturnTo(after_call), UnwindContinue()) |
| | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ |
| = note: this error originates in the macro `::core::intrinsics::mir::__internal_remove_let` which comes from the expansion of the macro `mir` (in Nightly builds, run with -Z macro-backtrace for more info) |
| |
| note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace |
| |
| error: aborting due to 1 previous error |
| |
