remove unneeded .as_ref() calls.

src/librustc_privacy/lib.rs

@@ -657,7 +657,7 @@ impl EmbargoVisitor<'tcx> {
                 .map(|module_hir_id| self.tcx.hir().expect_item(module_hir_id))
             {
                 if let hir::ItemKind::Mod(m) = &item.kind {
-                    for item_id in m.item_ids.as_ref() {
+                    for item_id in m.item_ids {
                         let item = self.tcx.hir().expect_item(item_id.id);
                         let def_id = self.tcx.hir().local_def_id(item_id.id);
                         if !self.tcx.hygienic_eq(segment.ident, item.ident, def_id) {

src/librustc_typeck/collect/type_of.rs

@@ -239,7 +239,7 @@ pub(super) fn type_of(tcx: TyCtxt<'_>, def_id: DefId) -> Ty<'_> {
                             .segments
                             .iter()
                             .filter_map(|seg| seg.args.as_ref())
-                            .map(|generic_args| generic_args.args.as_ref())
+                            .map(|generic_args| generic_args.args)
                             .find_map(|args| {
                                 args.iter()
                                     .filter(|arg| arg.is_const())

src/libstd/path.rs

@@ -2011,7 +2011,7 @@ impl Path {
     #[stable(feature = "rust1", since = "1.0.0")]
     pub fn file_name(&self) -> Option<&OsStr> {
         self.components().next_back().and_then(|p| match p {
-            Component::Normal(p) => Some(p.as_ref()),
+            Component::Normal(p) => Some(p),
             _ => None,
         })
     }