diff --git a/components/script/dom/identityhub.rs b/components/script/dom/identityhub.rs
index 515e9f7e1b1..c4d997bcd6d 100644
--- a/components/script/dom/identityhub.rs
+++ b/components/script/dom/identityhub.rs
@@ -54,7 +54,7 @@ impl IdentityHub {
 
 #[derive(Debug)]
 pub struct Identities {
-    surface: IdentityManager,
+    _surface: IdentityManager,
     #[cfg(any(target_os = "linux", target_os = "windows"))]
     vk_hub: IdentityHub,
     #[cfg(target_os = "windows")]
@@ -69,7 +69,7 @@ pub struct Identities {
 impl Identities {
     pub fn new() -> Self {
         Identities {
-            surface: IdentityManager::default(),
+            _surface: IdentityManager::default(),
             #[cfg(any(target_os = "linux", target_os = "windows"))]
             vk_hub: IdentityHub::new(),
             #[cfg(target_os = "windows")]
diff --git a/components/script_plugins/lib.rs b/components/script_plugins/lib.rs
index ed4afc96f8f..11d3b70609d 100644
--- a/components/script_plugins/lib.rs
+++ b/components/script_plugins/lib.rs
@@ -233,7 +233,7 @@ impl<'tcx> LateLintPass<'tcx> for UnrootedPass {
     /// must be #[unrooted_must_root_lint::must_root] themselves
     fn check_variant(&mut self, cx: &LateContext, var: &hir::Variant) {
         let ref map = cx.tcx.hir();
-        let parent_item = map.expect_item(map.get_parent_item(var.id));
+        let parent_item = map.expect_item(map.get_parent_item(var.id).expect_owner());
         let attrs = cx.tcx.hir().attrs(parent_item.hir_id());
         if !has_lint_attr(&self.symbols, &attrs, self.symbols.must_root) {
             match var.data {
diff --git a/ports/winit/app.rs b/ports/winit/app.rs
index 89078b2acce..582ddb94783 100644
--- a/ports/winit/app.rs
+++ b/ports/winit/app.rs
@@ -15,7 +15,7 @@ use servo::compositing::windowing::WindowEvent;
 use servo::config::opts::{self, parse_url_or_filename};
 use servo::servo_config::pref;
 use servo::servo_url::ServoUrl;
-use servo::{BrowserId, Servo};
+use servo::Servo;
 use std::cell::{Cell, RefCell};
 use std::collections::HashMap;
 use std::env;
diff --git a/rust-toolchain b/rust-toolchain
index 8d7bb1b087a..9999297eff6 100644
--- a/rust-toolchain
+++ b/rust-toolchain
@@ -1 +1 @@
-nightly-2021-11-16
+nightly-2021-12-02