add new rval, pull deref early

compiler/rustc_borrowck/src/lib.rs

@@ -1236,6 +1236,23 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
             | Rvalue::ShallowInitBox(ref operand, _ /*ty*/) => {
                 self.consume_operand(location, (operand, span), flow_state)
             }
+            Rvalue::CopyForDeref(place) => {
+                self.access_place(
+                    location,
+                    (place, span),
+                    (Deep, Read(ReadKind::Copy)),
+                    LocalMutationIsAllowed::No,
+                    flow_state,
+                );
+
+                // Finally, check if path was already moved.
+                self.check_if_path_or_subpath_is_moved(
+                    location,
+                    InitializationRequiringAction::Use,
+                    (place.as_ref(), span),
+                    flow_state,
+                );
+            }
 
             Rvalue::Len(place) | Rvalue::Discriminant(place) => {
                 let af = match *rvalue {