make super_projection take a PlaceRef

Author: henryboisdequin

compiler/rustc_middle/src/mir/visit.rs

@@ -1002,7 +1002,7 @@ macro_rules! visit_place_fns {
             context: PlaceContext,
             location: Location,
         ) {
-            self.super_projection(place_ref.local, place_ref.projection, context, location);
+            self.super_projection(place_ref, context, location);
         }
 
         fn visit_projection_elem(
@@ -1037,15 +1037,15 @@ macro_rules! visit_place_fns {
 
         fn super_projection(
             &mut self,
-            local: Local,
-            projection: &[PlaceElem<'tcx>],
+            place_ref: PlaceRef<'tcx>,
             context: PlaceContext,
             location: Location,
         ) {
-            let mut cursor = projection;
+            // FIXME: Use PlaceRef::iter_projections, once that exists.
+            let mut cursor = place_ref.projection;
             while let &[ref proj_base @ .., elem] = cursor {
                 cursor = proj_base;
-                self.visit_projection_elem(local, cursor, elem, context, location);
+                self.visit_projection_elem(place_ref.local, cursor, elem, context, location);
             }
         }
 

compiler/rustc_mir/src/transform/simplify.rs

@@ -414,8 +414,7 @@ impl UsedLocals {
         } else {
             // A definition. Although, it still might use other locals for indexing.
             self.super_projection(
-                place.local,
-                &place.projection,
+                place.as_ref(),
                 PlaceContext::MutatingUse(MutatingUseContext::Projection),
                 location,
             );