diff --git a/src/librustc_trans/lib.rs b/src/librustc_trans/lib.rs
index a38d51e754670..49d0f638f2061 100644
--- a/src/librustc_trans/lib.rs
+++ b/src/librustc_trans/lib.rs
@@ -29,7 +29,6 @@
 #![feature(slice_sort_by_cached_key)]
 #![feature(optin_builtin_traits)]
 #![feature(inclusive_range_fields)]
-#![feature(underscore_lifetimes)]
 
 use rustc::dep_graph::WorkProduct;
 use syntax_pos::symbol::Symbol;
diff --git a/src/librustc_typeck/lib.rs b/src/librustc_typeck/lib.rs
index a4477e80b988a..4b66939963ed0 100644
--- a/src/librustc_typeck/lib.rs
+++ b/src/librustc_typeck/lib.rs
@@ -82,7 +82,6 @@ This API is completely unstable and subject to change.
 #![feature(slice_patterns)]
 #![feature(slice_sort_by_cached_key)]
 #![feature(dyn_trait)]
-#![feature(underscore_lifetimes)]
 
 #[macro_use] extern crate log;
 #[macro_use] extern crate syntax;
diff --git a/src/libsyntax/feature_gate.rs b/src/libsyntax/feature_gate.rs
index 73ebfc20876d0..eaa2050f608f3 100644
--- a/src/libsyntax/feature_gate.rs
+++ b/src/libsyntax/feature_gate.rs
@@ -378,12 +378,6 @@ declare_features! (
     // Future-proofing enums/structs with #[non_exhaustive] attribute (RFC 2008)
     (active, non_exhaustive, "1.22.0", Some(44109), None),
 
-    // allow `'_` placeholder lifetimes
-    (active, underscore_lifetimes, "1.22.0", Some(44524), None),
-
-    // Default match binding modes (RFC 2005)
-    (active, match_default_bindings, "1.22.0", Some(42640), None),
-
     // Trait object syntax with `dyn` prefix
     (active, dyn_trait, "1.22.0", Some(44662), Some(Edition::Edition2018)),