Remove unnecessary continue.

Author: nnethercote

compiler/rustc_borrowck/src/prefixes.rs

@@ -53,7 +53,7 @@ impl<'tcx> Iterator for Prefixes<'tcx> {
         // may hold one further down (e.g., we never return
         // downcasts here, but may return a base of a downcast).
 
-        'cursor: loop {
+        loop {
             match cursor.last_projection() {
                 None => {
                     self.next = None;
@@ -72,7 +72,6 @@ impl<'tcx> Iterator for Prefixes<'tcx> {
                         | ProjectionElem::ConstantIndex { .. }
                         | ProjectionElem::Index(_) => {
                             cursor = cursor_base;
-                            continue 'cursor;
                         }
                         ProjectionElem::Subtype(..) => {
                             panic!("Subtype projection is not allowed before borrow check")