3 files changed, 3 insertions, 7 deletions
diff --git a/compiler/rustc_middle/src/lib.rs b/compiler/rustc_middle/src/lib.rs
index a675aae5b17..74cb3c130b7 100644
--- a/compiler/rustc_middle/src/lib.rs
+++ b/compiler/rustc_middle/src/lib.rs
@@ -23,6 +23,7 @@
 //! This API is completely unstable and subject to change.
 
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/")]
+#![feature(array_windows)]
 #![feature(backtrace)]
 #![feature(bool_to_option)]
 #![feature(box_patterns)]
@@ -30,12 +31,9 @@
 #![feature(cmp_min_max_by)]
 #![feature(const_fn)]
 #![feature(const_panic)]
-#![feature(const_fn_transmute)]
 #![feature(core_intrinsics)]
 #![feature(discriminant_kind)]
-#![feature(drain_filter)]
 #![feature(never_type)]
-#![feature(exhaustive_patterns)]
 #![feature(extern_types)]
 #![feature(nll)]
 #![feature(once_cell)]
@@ -43,13 +41,11 @@
 #![feature(or_patterns)]
 #![feature(min_specialization)]
 #![feature(trusted_len)]
-#![feature(stmt_expr_attributes)]
 #![feature(test)]
 #![feature(in_band_lifetimes)]
 #![feature(crate_visibility_modifier)]
 #![feature(associated_type_bounds)]
 #![feature(rustc_attrs)]
-#![feature(hash_raw_entry)]
 #![feature(int_error_matching)]
 #![recursion_limit = "512"]
 
diff --git a/compiler/rustc_middle/src/mir/mod.rs b/compiler/rustc_middle/src/mir/mod.rs
index be61b676807..12dc1c12264 100644
--- a/compiler/rustc_middle/src/mir/mod.rs
+++ b/compiler/rustc_middle/src/mir/mod.rs
@@ -2286,7 +2286,7 @@ impl<'tcx> Debug for Rvalue<'tcx> {
 /// Constants
 ///
 /// Two constants are equal if they are the same constant. Note that
-/// this does not necessarily mean that they are `==` in Rust -- in
+/// this does not necessarily mean that they are `==` in Rust. In
 /// particular, one must be wary of `NaN`!
 
 #[derive(Clone, Copy, PartialEq, TyEncodable, TyDecodable, HashStable)]
diff --git a/compiler/rustc_middle/src/ty/context.rs b/compiler/rustc_middle/src/ty/context.rs
index 56746666e2f..38c0441990b 100644
--- a/compiler/rustc_middle/src/ty/context.rs
+++ b/compiler/rustc_middle/src/ty/context.rs
@@ -2419,7 +2419,7 @@ impl<'tcx> TyCtxt<'tcx> {
         eps: &[ExistentialPredicate<'tcx>],
     ) -> &'tcx List<ExistentialPredicate<'tcx>> {
         assert!(!eps.is_empty());
-        assert!(eps.windows(2).all(|w| w[0].stable_cmp(self, &w[1]) != Ordering::Greater));
+        assert!(eps.array_windows().all(|[a, b]| a.stable_cmp(self, b) != Ordering::Greater));
         self._intern_existential_predicates(eps)
     }