message: Update for latest rustc changes
diff: @@ -367,6 +367,7 @@ impl<'a, 'tcx> EvalContext<'a, 'tcx> {
  PrimVal::Ptr(ptr)
  }
  + Variant(_) => unimplemented!(),
  Struct(_) => unimplemented!(),
  Tuple(_) => unimplemented!(),
  // function items are zero sized and thus have no readable value
  