1 error: Undefined Behavior: trying to retag from <TAG> for Unique permission at ALLOC[0x0], but that tag only grants SharedReadOnly permission for this location
2 --> RUSTLIB/core/src/ptr/mod.rs:LL:CC
4 LL | pub unsafe fn drop_in_place<T: ?Sized>(to_drop: *mut T) {
5 | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
7 | trying to retag from <TAG> for Unique permission at ALLOC[0x0], but that tag only grants SharedReadOnly permission for this location
8 | this error occurs as part of retag 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 SharedReadOnly retag at offsets [0x0..0x1]
13 --> $DIR/drop_in_place_retag.rs:LL:CC
15 LL | let x = core::ptr::addr_of!(x);
16 | ^^^^^^^^^^^^^^^^^^^^^^
18 = note: inside `std::ptr::drop_in_place::<u8> - shim(None)` at RUSTLIB/core/src/ptr/mod.rs:LL:CC
20 --> $DIR/drop_in_place_retag.rs:LL:CC
22 LL | core::ptr::drop_in_place(x.cast_mut());
23 | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
24 = note: this error originates in the macro `core::ptr::addr_of` (in Nightly builds, run with -Z macro-backtrace for more info)
26 note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
28 error: aborting due to previous error