Make the unrooted_must_root lint ignore references

components/plugins/lints/unrooted_must_root.rs

@@ -30,8 +30,7 @@ pub struct UnrootedPass;
 // TODO (#3874, sort of): unwrap other types like Vec/Option/HashMap/etc
 fn lint_unrooted_ty(cx: &Context, ty: &ast::Ty, warning: &str) {
     match ty.node {
-        ast::TyVec(ref t) | ast::TyFixedLengthVec(ref t, _) |
-        ast::TyPtr(ast::MutTy { ty: ref t, ..}) | ast::TyRptr(_, ast::MutTy { ty: ref t, ..}) => lint_unrooted_ty(cx, &**t, warning),
+        ast::TyVec(ref t) | ast::TyFixedLengthVec(ref t, _) => lint_unrooted_ty(cx, &**t, warning),
         ast::TyPath(..) => {
                 match cx.tcx.def_map.borrow()[&ty.id] {
                     def::PathResolution{ base_def: def::DefTy(def_id, _), .. } => {
@@ -42,7 +41,7 @@ fn lint_unrooted_ty(cx: &Context, ty: &ast::Ty, warning: &str) {
                     _ => (),
                 }
             }
-            _ => (),
+        _ => (),
     };
 }