error: Undefined Behavior: constructing invalid value: encountered an unaligned reference (required ALIGN byte alignment but found ALIGN)
  --> tests/fail/unaligned_pointers/reference_to_packed.rs:LL:CC
   |
LL |     mem::transmute(x)
   |     ^^^^^^^^^^^^^^^^^ Undefined Behavior occurred here
   |
   = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
   = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
   = note: BACKTRACE:
   = note: inside `raw_to_ref::<'_, i32>` at tests/fail/unaligned_pointers/reference_to_packed.rs:LL:CC
note: inside `main`
  --> tests/fail/unaligned_pointers/reference_to_packed.rs:LL:CC
   |
LL |         let p: &i32 = unsafe { raw_to_ref(ptr::addr_of!(foo.x)) };
   |                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

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

error: aborting due to 1 previous error