rustup for projection interning

rust-version

@@ -1 +1 @@
-8e0007f829661e57d008d2e908c95f6e84b04b25
+084edc426f2e7e4bbedb5c6afa7fc422a52ee379

src/helpers.rs

@@ -5,6 +5,7 @@
 use rustc::mir;
 use rustc::ty::{
     self,
+    List,
     layout::{self, LayoutOf, Size, TyLayout},
 };
 
@@ -75,7 +76,7 @@ fn test_null(&self, val: Scalar<Tag>) -> InterpResult<'tcx, Option<Scalar<Tag>>>
     /// Get the `Place` for a local
     fn local_place(&mut self, local: mir::Local) -> InterpResult<'tcx, PlaceTy<'tcx, Tag>> {
         let this = self.eval_context_mut();
-        let place = mir::Place { base: mir::PlaceBase::Local(local), projection: Box::new([]) };
+        let place = mir::Place { base: mir::PlaceBase::Local(local), projection: List::empty() };
         this.eval_place(&place)
     }