message: Rustup to rustc 1.31.0-nightly (96cafc53c 2018-10-09)
diff: @@ -279,6 +279,7 @@ impl<'a, 'mir, 'tcx> Machine<'a, 'mir, 'tcx> for TransPlaceInterpreter {
  type MemoryData = ();
  type MemoryKinds = ();
  const MUT_STATIC_KIND: Option<()> = None;
  + const ENFORCE_VALIDITY: bool = true;
  fn before_terminator(_: &mut EvalContext<'a, 'mir, 'tcx, Self>) -> EvalResult<'tcx> {
  panic!();
  