error: Undefined Behavior: write access through <TAG> is forbidden because it is a foreign tag for <TAG>, which would hence change from Reserved to Disabled, but <TAG> is protected
  --> $DIR/outside-range.rs:LL:CC
   |
LL |     *y.add(3) = 42;
   |     ^^^^^^^^^^^^^^ write access through <TAG> is forbidden because it is a foreign tag for <TAG>, which would hence change from Reserved to Disabled, but <TAG> is protected
   |
   = help: this indicates a potential bug in the program: it performed an invalid operation, but the Tree Borrows rules it violated are still experimental
   = note: BACKTRACE:
   = note: inside `stuff` at $DIR/outside-range.rs:LL:CC
note: inside `main`
  --> $DIR/outside-range.rs:LL:CC
   |
LL |         stuff(&mut *raw, raw);
   |         ^^^^^^^^^^^^^^^^^^^^^

note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace

error: aborting due to previous error