Remove PlaceContext from API of mir::Visitor::visit_projection_elem.

It is unused, and would not make sense to maintain in the commits later in this PR.

Author: pnkfelix

src/librustc/mir/visit.rs

@@ -175,9 +175,8 @@ macro_rules! make_mir_visitor {
 
             fn visit_projection_elem(&mut self,
                                      place: & $($mutability)* PlaceElem<'tcx>,
-                                     context: PlaceContext<'tcx>,
                                      location: Location) {
-                self.super_projection_elem(place, context, location);
+                self.super_projection_elem(place, location);
             }
 
             fn visit_branch(&mut self,
@@ -692,12 +691,11 @@ macro_rules! make_mir_visitor {
                     PlaceContext::Projection(Mutability::Not)
                 };
                 self.visit_place(base, context, location);
-                self.visit_projection_elem(elem, context, location);
+                self.visit_projection_elem(elem, location);
             }
 
             fn super_projection_elem(&mut self,
                                      proj: & $($mutability)* PlaceElem<'tcx>,
-                                     _context: PlaceContext<'tcx>,
                                      location: Location) {
                 match *proj {
                     ProjectionElem::Deref => {

src/librustc_passes/mir_stats.rs

@@ -211,7 +211,6 @@ impl<'a, 'tcx> mir_visit::Visitor<'tcx> for StatCollector<'a, 'tcx> {
 
     fn visit_projection_elem(&mut self,
                              place: &PlaceElem<'tcx>,
-                             context: mir_visit::PlaceContext<'tcx>,
                              location: Location) {
         self.record("PlaceElem", place);
         self.record(match *place {
@@ -222,7 +221,7 @@ impl<'a, 'tcx> mir_visit::Visitor<'tcx> for StatCollector<'a, 'tcx> {
             ProjectionElem::ConstantIndex { .. } => "PlaceElem::ConstantIndex",
             ProjectionElem::Downcast(..) => "PlaceElem::Downcast",
         }, place);
-        self.super_projection_elem(place, context, location);
+        self.super_projection_elem(place, location);
     }
 
     fn visit_constant(&mut self, constant: &Constant<'tcx>, location: Location) {