diff --git a/examples/intrinsics.rs b/examples/intrinsics.rs
index 6dcd3820f..06d772330 100644
--- a/examples/intrinsics.rs
+++ b/examples/intrinsics.rs
@@ -4,12 +4,10 @@
 // to link due to the missing intrinsic (symbol).
 
 #![allow(unused_features)]
-#![allow(stable_features)] // bench_black_box feature is stable, leaving for backcompat
 #![allow(internal_features)]
 #![cfg_attr(thumb, no_main)]
 #![deny(dead_code)]
 #![feature(allocator_api)]
-#![feature(bench_black_box)]
 #![feature(f128)]
 #![feature(f16)]
 #![feature(lang_items)]
diff --git a/src/lib.rs b/src/lib.rs
index b85f789fd..dea30a3c6 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,18 +1,12 @@
 #![cfg_attr(feature = "compiler-builtins", compiler_builtins)]
-#![cfg_attr(not(feature = "no-asm"), feature(asm))]
 #![feature(abi_unadjusted)]
 #![feature(asm_experimental_arch)]
-#![cfg_attr(not(feature = "no-asm"), feature(global_asm))]
 #![feature(cfg_target_has_atomic)]
 #![feature(compiler_builtins)]
-#![feature(core_ffi_c)]
 #![feature(core_intrinsics)]
-#![feature(inline_const)]
-#![feature(lang_items)]
 #![feature(linkage)]
 #![feature(naked_functions)]
 #![feature(repr_simd)]
-#![feature(c_unwind)]
 #![cfg_attr(f16_enabled, feature(f16))]
 #![cfg_attr(f128_enabled, feature(f128))]
 #![no_builtins]
diff --git a/testcrate/tests/aeabi_memclr.rs b/testcrate/tests/aeabi_memclr.rs
index 595076939..bfd15a391 100644
--- a/testcrate/tests/aeabi_memclr.rs
+++ b/testcrate/tests/aeabi_memclr.rs
@@ -5,7 +5,6 @@
     feature = "mem"
 ))]
 #![feature(compiler_builtins_lib)]
-#![feature(lang_items)]
 #![no_std]
 
 extern crate compiler_builtins;
diff --git a/testcrate/tests/aeabi_memcpy.rs b/testcrate/tests/aeabi_memcpy.rs
index 2d72dfbba..c892c5aba 100644
--- a/testcrate/tests/aeabi_memcpy.rs
+++ b/testcrate/tests/aeabi_memcpy.rs
@@ -5,7 +5,6 @@
     feature = "mem"
 ))]
 #![feature(compiler_builtins_lib)]
-#![feature(lang_items)]
 #![no_std]
 
 extern crate compiler_builtins;
diff --git a/testcrate/tests/aeabi_memset.rs b/testcrate/tests/aeabi_memset.rs
index f03729bed..34ab3acc7 100644
--- a/testcrate/tests/aeabi_memset.rs
+++ b/testcrate/tests/aeabi_memset.rs
@@ -5,7 +5,6 @@
     feature = "mem"
 ))]
 #![feature(compiler_builtins_lib)]
-#![feature(lang_items)]
 #![no_std]
 
 extern crate compiler_builtins;