error: Undefined Behavior: not granting access to tag <TAG> because that would remove [Unique for <TAG>] which is strongly protected because it is an argument of call ID
  --> $DIR/drop_in_place_protector.rs:LL:CC
   |
LL |             let _val = *P;
   |                        ^^ not granting access to tag <TAG> because that would remove [Unique for <TAG>] which is strongly protected because it is an argument of call ID
   |
   = 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 SharedReadWrite retag at offsets [0x0..0x1]
  --> $DIR/drop_in_place_protector.rs:LL:CC
   |
LL |         let x = core::ptr::addr_of_mut!(x);
   |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^
help: <TAG> is this argument
  --> $DIR/drop_in_place_protector.rs:LL:CC
   |
LL |         core::ptr::drop_in_place(x);
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
   = note: BACKTRACE:
   = note: inside `<HasDrop as std::ops::Drop>::drop` at $DIR/drop_in_place_protector.rs:LL:CC
   = note: inside `std::ptr::drop_in_place::<HasDrop> - shim(Some(HasDrop))` at RUSTLIB/core/src/ptr/mod.rs:LL:CC
   = note: inside `std::ptr::drop_in_place::<(HasDrop, u8)> - shim(Some((HasDrop, u8)))` at RUSTLIB/core/src/ptr/mod.rs:LL:CC
note: inside `main`
  --> $DIR/drop_in_place_protector.rs:LL:CC
   |
LL |         core::ptr::drop_in_place(x);
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
   = note: this error originates in the macro `core::ptr::addr_of_mut` (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 previous error