diff --git a/components/config_plugins/lib.rs b/components/config_plugins/lib.rs
index bd2ae2ca6e5..943a5ffc99c 100644
--- a/components/config_plugins/lib.rs
+++ b/components/config_plugins/lib.rs
@@ -4,8 +4,6 @@
 
 #![feature(proc_macro_diagnostic)]
 
-extern crate proc_macro;
-
 use itertools::Itertools;
 use proc_macro2::{Span, TokenStream};
 use quote::*;
diff --git a/components/deny_public_fields/lib.rs b/components/deny_public_fields/lib.rs
index 3d50ad4deec..3f6d8b48cf3 100644
--- a/components/deny_public_fields/lib.rs
+++ b/components/deny_public_fields/lib.rs
@@ -2,8 +2,6 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
-extern crate proc_macro;
-
 use std::str::FromStr;
 use synstructure::{self, decl_derive};
 
diff --git a/components/domobject_derive/lib.rs b/components/domobject_derive/lib.rs
index 1b082fc9e54..fdc2c84b26e 100644
--- a/components/domobject_derive/lib.rs
+++ b/components/domobject_derive/lib.rs
@@ -4,7 +4,6 @@
 
 #![recursion_limit = "128"]
 
-extern crate proc_macro;
 #[macro_use]
 extern crate quote;
 #[macro_use]
diff --git a/components/layout/lib.rs b/components/layout/lib.rs
index 582a3e284d5..fdf3971fc3f 100644
--- a/components/layout/lib.rs
+++ b/components/layout/lib.rs
@@ -3,7 +3,6 @@
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
 #![deny(unsafe_code)]
-#![feature(matches_macro)]
 
 #[macro_use]
 extern crate bitflags;
diff --git a/components/layout_2020/lib.rs b/components/layout_2020/lib.rs
index b8cc003caf5..28ad31ae146 100644
--- a/components/layout_2020/lib.rs
+++ b/components/layout_2020/lib.rs
@@ -4,7 +4,6 @@
 
 #![deny(unsafe_code)]
 #![feature(exact_size_is_empty)]
-#![feature(matches_macro)]
 
 pub mod context;
 pub mod data;
diff --git a/components/script_plugins/lib.rs b/components/script_plugins/lib.rs
index 0bd43021a2e..89a7312d0a0 100644
--- a/components/script_plugins/lib.rs
+++ b/components/script_plugins/lib.rs
@@ -23,21 +23,24 @@
 extern crate matches;
 extern crate rustc;
 extern crate rustc_driver;
+extern crate rustc_hir;
+extern crate rustc_lint;
 extern crate rustc_session;
+extern crate rustc_span;
 extern crate syntax;
 
-use rustc::hir::def_id::DefId;
-use rustc::hir::intravisit as visit;
-use rustc::hir::{self, ExprKind, HirId};
-use rustc::lint::{LateContext, LateLintPass, LintContext, LintPass};
 use rustc::ty;
 use rustc_driver::plugin::Registry;
+use rustc_hir::def_id::DefId;
+use rustc_hir::intravisit as visit;
+use rustc_hir::{self as hir, ExprKind, HirId};
+use rustc_lint::{LateContext, LateLintPass, LintContext, LintPass};
 use rustc_session::declare_lint;
+use rustc_span::source_map;
+use rustc_span::source_map::{ExpnKind, MacroKind, Span};
+use rustc_span::symbol::sym;
+use rustc_span::symbol::Symbol;
 use syntax::ast::{AttrKind, Attribute};
-use syntax::source_map;
-use syntax::source_map::{ExpnKind, MacroKind, Span};
-use syntax::symbol::sym;
-use syntax::symbol::Symbol;
 
 #[allow(deprecated)]
 #[plugin_registrar]
@@ -290,6 +293,8 @@ struct FnDefVisitor<'a, 'b: 'a, 'tcx: 'a + 'b> {
 }
 
 impl<'a, 'b, 'tcx> visit::Visitor<'tcx> for FnDefVisitor<'a, 'b, 'tcx> {
+    type Map = rustc::hir::map::Map<'tcx>;
+
     fn visit_expr(&mut self, expr: &'tcx hir::Expr) {
         let cx = self.cx;
 
@@ -353,7 +358,9 @@ impl<'a, 'b, 'tcx> visit::Visitor<'tcx> for FnDefVisitor<'a, 'b, 'tcx> {
 
     fn visit_ty(&mut self, _: &'tcx hir::Ty) {}
 
-    fn nested_visit_map<'this>(&'this mut self) -> hir::intravisit::NestedVisitorMap<'this, 'tcx> {
+    fn nested_visit_map<'this>(
+        &'this mut self,
+    ) -> hir::intravisit::NestedVisitorMap<'this, Self::Map> {
         hir::intravisit::NestedVisitorMap::OnlyBodies(&self.cx.tcx.hir())
     }
 }
diff --git a/rust-toolchain b/rust-toolchain
index 85efddc5ce0..20d9cdab46e 100644
--- a/rust-toolchain
+++ b/rust-toolchain
@@ -1 +1 @@
-nightly-2019-12-23
+nightly-2020-01-16