Remove underscore_lifetimes and match_default_bindings from active feature list

These are already stabilized in 1.26.

Author: kennytm

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;

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;

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)),