make matches exhaustive

Author: matthiaskrgr

src/librustc/mir/mod.rs

@@ -2462,11 +2462,15 @@ impl<'tcx> TypeFoldable<'tcx> for UserTypeProjection {
         let projs: Vec<_> = self
             .projs
             .iter()
-            .map(|elem| match elem {
+            .map(|&elem| match elem {
                 Deref => Deref,
-                Field(f, ()) => Field(*f, ()),
+                Field(f, ()) => Field(f, ()),
                 Index(()) => Index(()),
-                elem => *elem,
+                Downcast(symbol, variantidx) => Downcast(symbol, variantidx),
+                ConstantIndex { offset, min_length, from_end } => {
+                    ConstantIndex { offset, min_length, from_end }
+                }
+                Subslice { from, to, from_end } => Subslice { from, to, from_end },
             })
             .collect();
 
@@ -2862,11 +2866,15 @@ impl<'tcx> TypeFoldable<'tcx> for PlaceElem<'tcx> {
     fn super_fold_with<F: TypeFolder<'tcx>>(&self, folder: &mut F) -> Self {
         use crate::mir::ProjectionElem::*;
 
-        match self {
+        match *self {
             Deref => Deref,
-            Field(f, ty) => Field(*f, ty.fold_with(folder)),
+            Field(f, ty) => Field(f, ty.fold_with(folder)),
             Index(v) => Index(v.fold_with(folder)),
-            elem => *elem,
+            Downcast(symbol, variantidx) => Downcast(symbol, variantidx),
+            ConstantIndex { offset, min_length, from_end } => {
+                ConstantIndex { offset, min_length, from_end }
+            }
+            Subslice { from, to, from_end } => Subslice { from, to, from_end },
         }
     }