Stabilize const-calling existing const-fns in std

Fixes #46038

45 files changed, 8 insertions, 164 deletions

diff --git a/src/libcore/cell.rs b/src/libcore/cell.rs
index d02576ae546..d4cd3f6264e 100644
--- a/src/libcore/cell.rs
+++ b/src/libcore/cell.rs
@@ -329,7 +329,6 @@ impl<T> Cell<T> {
     /// let c = Cell::new(5);
     /// ```
     #[stable(feature = "rust1", since = "1.0.0")]
-    #[rustc_const_unstable(feature = "const_cell_new")]
     #[inline]
     pub const fn new(value: T) -> Cell<T> {
         Cell {
@@ -544,7 +543,6 @@ impl<T> RefCell<T> {
     /// let c = RefCell::new(5);
     /// ```
     #[stable(feature = "rust1", since = "1.0.0")]
-    #[rustc_const_unstable(feature = "const_refcell_new")]
     #[inline]
     pub const fn new(value: T) -> RefCell<T> {
         RefCell {
@@ -1215,7 +1213,6 @@ impl<T> UnsafeCell<T> {
     /// let uc = UnsafeCell::new(5);
     /// ```
     #[stable(feature = "rust1", since = "1.0.0")]
-    #[rustc_const_unstable(feature = "const_unsafe_cell_new")]
     #[inline]
     pub const fn new(value: T) -> UnsafeCell<T> {
         UnsafeCell { value: value }
diff --git a/src/libcore/lib.rs b/src/libcore/lib.rs
index 631b9f98589..07b45ad6a50 100644
--- a/src/libcore/lib.rs
+++ b/src/libcore/lib.rs
@@ -85,47 +85,13 @@
 #![feature(prelude_import)]
 #![feature(repr_simd, platform_intrinsics)]
 #![feature(rustc_attrs)]
-#![feature(rustc_const_unstable)]
 #![feature(specialization)]
 #![feature(staged_api)]
 #![feature(unboxed_closures)]
 #![feature(untagged_unions)]
 #![feature(unwind_attributes)]
-#![feature(const_min_value)]
-#![feature(const_max_value)]
-#![feature(const_atomic_bool_new)]
-#![feature(const_atomic_isize_new)]
-#![feature(const_atomic_usize_new)]
-#![feature(const_atomic_i8_new)]
-#![feature(const_atomic_u8_new)]
-#![feature(const_atomic_i16_new)]
-#![feature(const_atomic_u16_new)]
-#![feature(const_atomic_i32_new)]
-#![feature(const_atomic_u32_new)]
-#![feature(const_atomic_i64_new)]
-#![feature(const_atomic_u64_new)]
-#![feature(const_unsafe_cell_new)]
-#![feature(const_cell_new)]
-#![feature(const_nonzero_new)]
 #![cfg_attr(not(stage0), feature(doc_spotlight))]
 
-#![cfg_attr(not(stage0), feature(const_min_value))]
-#![cfg_attr(not(stage0), feature(const_max_value))]
-#![cfg_attr(not(stage0), feature(const_atomic_bool_new))]
-#![cfg_attr(not(stage0), feature(const_atomic_isize_new))]
-#![cfg_attr(not(stage0), feature(const_atomic_usize_new))]
-#![cfg_attr(not(stage0), feature(const_atomic_i8_new))]
-#![cfg_attr(not(stage0), feature(const_atomic_u8_new))]
-#![cfg_attr(not(stage0), feature(const_atomic_i16_new))]
-#![cfg_attr(not(stage0), feature(const_atomic_u16_new))]
-#![cfg_attr(not(stage0), feature(const_atomic_i32_new))]
-#![cfg_attr(not(stage0), feature(const_atomic_u32_new))]
-#![cfg_attr(not(stage0), feature(const_atomic_i64_new))]
-#![cfg_attr(not(stage0), feature(const_atomic_u64_new))]
-#![cfg_attr(not(stage0), feature(const_unsafe_cell_new))]
-#![cfg_attr(not(stage0), feature(const_cell_new))]
-#![cfg_attr(not(stage0), feature(const_nonzero_new))]
-
 #[prelude_import]
 #[allow(unused)]
 use prelude::v1::*;
diff --git a/src/libcore/mem.rs b/src/libcore/mem.rs
index d57fbdf55f8..5b1a9399c39 100644
--- a/src/libcore/mem.rs
+++ b/src/libcore/mem.rs
@@ -311,7 +311,6 @@ pub fn forget<T>(t: T) {
 /// [alignment]: ./fn.align_of.html
 #[inline]
 #[stable(feature = "rust1", since = "1.0.0")]
-#[rustc_const_unstable(feature = "const_size_of")]
 pub const fn size_of<T>() -> usize {
     unsafe { intrinsics::size_of::<T>() }
 }
@@ -403,7 +402,6 @@ pub fn min_align_of_val<T: ?Sized>(val: &T) -> usize {
 /// ```
 #[inline]
 #[stable(feature = "rust1", since = "1.0.0")]
-#[rustc_const_unstable(feature = "const_align_of")]
 pub const fn align_of<T>() -> usize {
     unsafe { intrinsics::min_align_of::<T>() }
 }
diff --git a/src/libcore/nonzero.rs b/src/libcore/nonzero.rs
index edc0104f46b..a943adb7540 100644
--- a/src/libcore/nonzero.rs
+++ b/src/libcore/nonzero.rs
@@ -71,7 +71,6 @@ impl<T: Zeroable> NonZero<T> {
     #[unstable(feature = "nonzero",
                reason = "needs an RFC to flesh out the design",
                issue = "27730")]
-    #[rustc_const_unstable(feature = "const_nonzero_new")]
     #[inline]
     pub const unsafe fn new_unchecked(inner: T) -> Self {
         NonZero(inner)
diff --git a/src/libcore/num/mod.rs b/src/libcore/num/mod.rs
index 1230066e2b3..bfa00f895c0 100644
--- a/src/libcore/num/mod.rs
+++ b/src/libcore/num/mod.rs
@@ -110,7 +110,6 @@ macro_rules! int_impl {
         /// assert_eq!(i8::min_value(), -128);
         /// ```
         #[stable(feature = "rust1", since = "1.0.0")]
-        #[rustc_const_unstable(feature = "const_min_value")]
         #[inline]
         pub const fn min_value() -> Self {
             !0 ^ ((!0 as $UnsignedT) >> 1) as Self
@@ -124,7 +123,6 @@ macro_rules! int_impl {
         /// assert_eq!(i8::max_value(), 127);
         /// ```
         #[stable(feature = "rust1", since = "1.0.0")]
-        #[rustc_const_unstable(feature = "const_max_value")]
         #[inline]
         pub const fn max_value() -> Self {
             !Self::min_value()
@@ -1283,7 +1281,6 @@ macro_rules! uint_impl {
         /// assert_eq!(u8::min_value(), 0);
         /// ```
         #[stable(feature = "rust1", since = "1.0.0")]
-        #[rustc_const_unstable(feature = "const_min_value")]
         #[inline]
         pub const fn min_value() -> Self { 0 }
 
@@ -1295,7 +1292,6 @@ macro_rules! uint_impl {
         /// assert_eq!(u8::max_value(), 255);
         /// ```
         #[stable(feature = "rust1", since = "1.0.0")]
-        #[rustc_const_unstable(feature = "const_max_value")]
         #[inline]
         pub const fn max_value() -> Self { !0 }
 
diff --git a/src/libcore/ptr.rs b/src/libcore/ptr.rs
index 126558e3025..0c2fcd082ef 100644
--- a/src/libcore/ptr.rs
+++ b/src/libcore/ptr.rs
@@ -74,7 +74,6 @@ pub unsafe fn drop_in_place<T: ?Sized>(to_drop: *mut T) {
 /// ```
 #[inline]
 #[stable(feature = "rust1", since = "1.0.0")]
-#[rustc_const_unstable(feature = "const_ptr_null")]
 pub const fn null<T>() -> *const T { 0 as *const T }
 
 /// Creates a null mutable raw pointer.
@@ -89,7 +88,6 @@ pub const fn null<T>() -> *const T { 0 as *const T }
 /// ```
 #[inline]
 #[stable(feature = "rust1", since = "1.0.0")]
-#[rustc_const_unstable(feature = "const_ptr_null_mut")]
 pub const fn null_mut<T>() -> *mut T { 0 as *mut T }
 
 /// Swaps the values at two mutable locations of the same type, without
@@ -2339,7 +2337,6 @@ impl<T: ?Sized> Unique<T> {
     ///
     /// `ptr` must be non-null.
     #[unstable(feature = "unique", issue = "27730")]
-    #[rustc_const_unstable(feature = "const_unique_new")]
     pub const unsafe fn new_unchecked(ptr: *mut T) -> Self {
         Unique { pointer: NonZero::new_unchecked(ptr), _marker: PhantomData }
     }
@@ -2474,7 +2471,6 @@ impl<T: ?Sized> Shared<T> {
     ///
     /// `ptr` must be non-null.
     #[unstable(feature = "shared", issue = "27730")]
-    #[rustc_const_unstable(feature = "const_shared_new")]
     pub const unsafe fn new_unchecked(ptr: *mut T) -> Self {
         Shared { pointer: NonZero::new_unchecked(ptr), _marker: PhantomData }
     }
diff --git a/src/libcore/sync/atomic.rs b/src/libcore/sync/atomic.rs
index b7cf6d778a2..2cabadebfb7 100644
--- a/src/libcore/sync/atomic.rs
+++ b/src/libcore/sync/atomic.rs
@@ -243,7 +243,6 @@ impl AtomicBool {
     /// ```
     #[inline]
     #[stable(feature = "rust1", since = "1.0.0")]
-    #[rustc_const_unstable(feature = "const_atomic_bool_new")]
     pub const fn new(v: bool) -> AtomicBool {
         AtomicBool { v: UnsafeCell::new(v as u8) }
     }
@@ -657,7 +656,6 @@ impl<T> AtomicPtr<T> {
     /// ```
     #[inline]
     #[stable(feature = "rust1", since = "1.0.0")]
-    #[rustc_const_unstable(feature = "const_atomic_ptr_new")]
     pub const fn new(p: *mut T) -> AtomicPtr<T> {
         AtomicPtr { p: UnsafeCell::new(p) }
     }
@@ -936,7 +934,7 @@ impl<T> From<*mut T> for AtomicPtr<T> {
 
 #[cfg(target_has_atomic = "ptr")]
 macro_rules! atomic_int {
-    ($stable:meta, $const_unstable:meta,
+    ($stable:meta,
      $stable_cxchg:meta,
      $stable_debug:meta,
      $stable_access:meta,
@@ -1005,7 +1003,6 @@ macro_rules! atomic_int {
             /// ```
             #[inline]
             #[$stable]
-            #[$const_unstable]
             pub const fn new(v: $int_type) -> Self {
                 $atomic_type {v: UnsafeCell::new(v)}
             }
@@ -1369,7 +1366,6 @@ macro_rules! atomic_int {
 #[cfg(target_has_atomic = "8")]
 atomic_int! {
     unstable(feature = "integer_atomics", issue = "32976"),
-    rustc_const_unstable(feature = "const_atomic_i8_new"),
     unstable(feature = "integer_atomics", issue = "32976"),
     unstable(feature = "integer_atomics", issue = "32976"),
     unstable(feature = "integer_atomics", issue = "32976"),
@@ -1379,7 +1375,6 @@ atomic_int! {
 #[cfg(target_has_atomic = "8")]
 atomic_int! {
     unstable(feature = "integer_atomics", issue = "32976"),
-    rustc_const_unstable(feature = "const_atomic_u8_new"),
     unstable(feature = "integer_atomics", issue = "32976"),
     unstable(feature = "integer_atomics", issue = "32976"),
     unstable(feature = "integer_atomics", issue = "32976"),
@@ -1389,7 +1384,6 @@ atomic_int! {
 #[cfg(target_has_atomic = "16")]
 atomic_int! {
     unstable(feature = "integer_atomics", issue = "32976"),
-    rustc_const_unstable(feature = "const_atomic_i16_new"),
     unstable(feature = "integer_atomics", issue = "32976"),
     unstable(feature = "integer_atomics", issue = "32976"),
     unstable(feature = "integer_atomics", issue = "32976"),
@@ -1399,7 +1393,6 @@ atomic_int! {
 #[cfg(target_has_atomic = "16")]
 atomic_int! {
     unstable(feature = "integer_atomics", issue = "32976"),
-    rustc_const_unstable(feature = "const_atomic_u16_new"),
     unstable(feature = "integer_atomics", issue = "32976"),
     unstable(feature = "integer_atomics", issue = "32976"),
     unstable(feature = "integer_atomics", issue = "32976"),
@@ -1409,7 +1402,6 @@ atomic_int! {
 #[cfg(target_has_atomic = "32")]
 atomic_int! {
     unstable(feature = "integer_atomics", issue = "32976"),
-    rustc_const_unstable(feature = "const_atomic_i32_new"),
     unstable(feature = "integer_atomics", issue = "32976"),
     unstable(feature = "integer_atomics", issue = "32976"),
     unstable(feature = "integer_atomics", issue = "32976"),
@@ -1419,7 +1411,6 @@ atomic_int! {
 #[cfg(target_has_atomic = "32")]
 atomic_int! {
     unstable(feature = "integer_atomics", issue = "32976"),
-    rustc_const_unstable(feature = "const_atomic_u32_new"),
     unstable(feature = "integer_atomics", issue = "32976"),
     unstable(feature = "integer_atomics", issue = "32976"),
     unstable(feature = "integer_atomics", issue = "32976"),
@@ -1429,7 +1420,6 @@ atomic_int! {
 #[cfg(target_has_atomic = "64")]
 atomic_int! {
     unstable(feature = "integer_atomics", issue = "32976"),
-    rustc_const_unstable(feature = "const_atomic_i64_new"),
     unstable(feature = "integer_atomics", issue = "32976"),
     unstable(feature = "integer_atomics", issue = "32976"),
     unstable(feature = "integer_atomics", issue = "32976"),
@@ -1439,7 +1429,6 @@ atomic_int! {
 #[cfg(target_has_atomic = "64")]
 atomic_int! {
     unstable(feature = "integer_atomics", issue = "32976"),
-    rustc_const_unstable(feature = "const_atomic_u64_new"),
     unstable(feature = "integer_atomics", issue = "32976"),
     unstable(feature = "integer_atomics", issue = "32976"),
     unstable(feature = "integer_atomics", issue = "32976"),
@@ -1449,7 +1438,6 @@ atomic_int! {
 #[cfg(target_has_atomic = "ptr")]
 atomic_int!{
     stable(feature = "rust1", since = "1.0.0"),
-    rustc_const_unstable(feature = "const_atomic_isize_new"),
     stable(feature = "extended_compare_and_swap", since = "1.10.0"),
     stable(feature = "atomic_debug", since = "1.3.0"),
     stable(feature = "atomic_access", since = "1.15.0"),
@@ -1459,7 +1447,6 @@ atomic_int!{
 #[cfg(target_has_atomic = "ptr")]
 atomic_int!{
     stable(feature = "rust1", since = "1.0.0"),
-    rustc_const_unstable(feature = "const_atomic_usize_new"),
     stable(feature = "extended_compare_and_swap", since = "1.10.0"),
     stable(feature = "atomic_debug", since = "1.3.0"),
     stable(feature = "atomic_access", since = "1.15.0"),
diff --git a/src/libcore/tests/lib.rs b/src/libcore/tests/lib.rs
index e2283a71a0a..0e445cdac35 100644
--- a/src/libcore/tests/lib.rs
+++ b/src/libcore/tests/lib.rs
@@ -42,10 +42,6 @@
 #![feature(try_trait)]
 #![feature(unique)]
 
-#![feature(const_atomic_bool_new)]
-#![feature(const_atomic_usize_new)]
-#![feature(const_atomic_isize_new)]
-
 extern crate core;
 extern crate test;
 
diff --git a/src/librustc/lib.rs b/src/librustc/lib.rs
index b59f7480476..a8c80aaa030 100644
--- a/src/librustc/lib.rs
+++ b/src/librustc/lib.rs
@@ -64,7 +64,6 @@
 #![feature(underscore_lifetimes)]
 #![feature(trace_macros)]
 #![feature(test)]
-#![feature(const_atomic_bool_new)]
 
 #![recursion_limit="512"]
 
diff --git a/src/librustc_apfloat/lib.rs b/src/librustc_apfloat/lib.rs
index 09c9cecdcee..7dea3dae0bc 100644
--- a/src/librustc_apfloat/lib.rs
+++ b/src/librustc_apfloat/lib.rs
@@ -45,8 +45,6 @@
 #![deny(warnings)]
 #![forbid(unsafe_code)]
 
-#![feature(const_max_value)]
-#![feature(const_min_value)]
 #![feature(i128_type)]
 #![feature(slice_patterns)]
 #![feature(try_from)]
diff --git a/src/librustc_const_eval/lib.rs b/src/librustc_const_eval/lib.rs
index 714cead4bef..5e569e21de7 100644
--- a/src/librustc_const_eval/lib.rs
+++ b/src/librustc_const_eval/lib.rs
@@ -25,8 +25,6 @@
 #![feature(box_syntax)]
 #![feature(i128_type)]
 
-#![feature(const_min_value)]
-
 extern crate arena;
 #[macro_use] extern crate syntax;
 #[macro_use] extern crate log;
diff --git a/src/librustc_const_math/lib.rs b/src/librustc_const_math/lib.rs
index c6893acb31f..095b8bb50dc 100644
--- a/src/librustc_const_math/lib.rs
+++ b/src/librustc_const_math/lib.rs
@@ -22,9 +22,6 @@
 #![feature(i128)]
 #![feature(i128_type)]
 
-#![feature(const_min_value)]
-#![feature(const_max_value)]
-
 extern crate rustc_apfloat;
 
 extern crate syntax;
diff --git a/src/librustc_mir/diagnostics.rs b/src/librustc_mir/diagnostics.rs
index 0f67f7bf6de..619c0dc847e 100644
--- a/src/librustc_mir/diagnostics.rs
+++ b/src/librustc_mir/diagnostics.rs
@@ -770,8 +770,6 @@ static B: &'static AtomicUsize = &A; // ok!
 You can also have this error while using a cell type:
 
 ```compile_fail,E0492
-#![feature(const_cell_new)]
-
 use std::cell::Cell;
 
 const A: Cell<usize> = Cell::new(1);
@@ -798,8 +796,6 @@ However, if you still wish to use these types, you can achieve this by an unsafe
 wrapper:
 
 ```
-#![feature(const_cell_new)]
-
 use std::cell::Cell;
 use std::marker::Sync;
 
diff --git a/src/librustc_trans/lib.rs b/src/librustc_trans/lib.rs
index 923d93587e9..3d1bd81fe21 100644
--- a/src/librustc_trans/lib.rs
+++ b/src/librustc_trans/lib.rs
@@ -33,9 +33,6 @@
 #![feature(slice_patterns)]
 #![feature(conservative_impl_trait)]
 
-#![feature(const_atomic_bool_new)]
-#![feature(const_once_new)]
-
 use rustc::dep_graph::WorkProduct;
 use syntax_pos::symbol::Symbol;
 
diff --git a/src/libstd/lib.rs b/src/libstd/lib.rs
index 9587bb424bd..bf177ac7f2c 100644
--- a/src/libstd/lib.rs
+++ b/src/libstd/lib.rs
@@ -256,15 +256,6 @@
 #![feature(collections_range)]
 #![feature(compiler_builtins_lib)]
 #![feature(const_fn)]
-#![feature(const_max_value)]
-#![feature(const_atomic_bool_new)]
-#![feature(const_atomic_isize_new)]
-#![feature(const_atomic_usize_new)]
-#![feature(const_unsafe_cell_new)]
-#![feature(const_cell_new)]
-#![feature(const_once_new)]
-#![feature(const_ptr_null)]
-#![feature(const_ptr_null_mut)]
 #![feature(core_float)]
 #![feature(core_intrinsics)]
 #![feature(dropck_eyepatch)]
@@ -306,7 +297,6 @@
 #![feature(repr_align)]
 #![feature(repr_simd)]
 #![feature(rustc_attrs)]
-#![feature(rustc_const_unstable)]
 #![feature(shared)]
 #![feature(sip_hash_13)]
 #![feature(slice_bytes)]
@@ -331,7 +321,6 @@
 #![feature(doc_masked)]
 #![feature(doc_spotlight)]
 #![cfg_attr(test, feature(update_panic_count))]
-#![cfg_attr(windows, feature(const_atomic_ptr_new))]
 #![cfg_attr(windows, feature(used))]
 
 #![default_lib_allocator]
diff --git a/src/libstd/sync/once.rs b/src/libstd/sync/once.rs
index 2ef99525af5..6fd8b6a5bba 100644
--- a/src/libstd/sync/once.rs
+++ b/src/libstd/sync/once.rs
@@ -156,7 +156,6 @@ struct Finish {
 impl Once {
     /// Creates a new `Once` value.
     #[stable(feature = "once_new", since = "1.2.0")]
-    #[rustc_const_unstable(feature = "const_once_new")]
     pub const fn new() -> Once {
         Once {
             state: AtomicUsize::new(INCOMPLETE),
diff --git a/src/test/compile-fail-fulldeps/dropck_tarena_cycle_checked.rs b/src/test/compile-fail-fulldeps/dropck_tarena_cycle_checked.rs
index fa85432fb8e..bc88ff9244c 100644
--- a/src/test/compile-fail-fulldeps/dropck_tarena_cycle_checked.rs
+++ b/src/test/compile-fail-fulldeps/dropck_tarena_cycle_checked.rs
@@ -17,7 +17,6 @@
 //  for the error message we see here.)
 
 #![feature(rustc_private)]
-#![feature(const_atomic_usize_new)]
 
 extern crate arena;
 
diff --git a/src/test/compile-fail/const-fn-feature-flags.rs b/src/test/compile-fail/const-fn-feature-flags.rs
deleted file mode 100644
index 823cb89b365..00000000000
--- a/src/test/compile-fail/const-fn-feature-flags.rs
+++ /dev/null
@@ -1,24 +0,0 @@
-// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
-// file at the top-level directory of this distribution and at
-// http://rust-lang.org/COPYRIGHT.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
-
-// Test use of const fns in std using individual feature gates.
-
-use std::cell::Cell;
-
-const CELL: Cell<i32> = Cell::new(42); //~ERROR not yet stable as a const fn
-    //~^HELP #![feature(const_cell_new)]
-
-fn main() {
-    let v = CELL.get();
-    CELL.set(v+1);
-
-    assert_eq!(CELL.get(), v);
-}
-
diff --git a/src/test/compile-fail/dropck_trait_cycle_checked.rs b/src/test/compile-fail/dropck_trait_cycle_checked.rs
index c0f0e3650d9..b6b7fa1a233 100644
--- a/src/test/compile-fail/dropck_trait_cycle_checked.rs
+++ b/src/test/compile-fail/dropck_trait_cycle_checked.rs
@@ -13,8 +13,6 @@
 //
 // (Compare against compile-fail/dropck_vec_cycle_checked.rs)
 
-#![feature(const_atomic_usize_new)]
-
 use std::cell::Cell;
 use id::Id;
 
diff --git a/src/test/compile-fail/issue-17718-const-borrow.rs b/src/test/compile-fail/issue-17718-const-borrow.rs
index 1464fcd9a1c..07123c69492 100644
--- a/src/test/compile-fail/issue-17718-const-borrow.rs
+++ b/src/test/compile-fail/issue-17718-const-borrow.rs
@@ -8,8 +8,6 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#![feature(const_unsafe_cell_new)]
-
 use std::cell::UnsafeCell;
 
 const A: UnsafeCell<usize> = UnsafeCell::new(1);
diff --git a/src/test/compile-fail/issue-43733-2.rs b/src/test/compile-fail/issue-43733-2.rs
index 1bf165c89d3..0fd31454596 100644
--- a/src/test/compile-fail/issue-43733-2.rs
+++ b/src/test/compile-fail/issue-43733-2.rs
@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#![feature(const_fn, const_cell_new, const_unsafe_cell_new)]
+#![feature(const_fn)]
 #![feature(cfg_target_thread_local, thread_local_internals)]
 
 // On platforms *without* `#[thread_local]`, use
diff --git a/src/test/compile-fail/issue-7364.rs b/src/test/compile-fail/issue-7364.rs
index ef53be75780..3979790e3d4 100644
--- a/src/test/compile-fail/issue-7364.rs
+++ b/src/test/compile-fail/issue-7364.rs
@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#![feature(box_syntax, const_refcell_new)]
+#![feature(box_syntax)]
 
 use std::cell::RefCell;
 
diff --git a/src/test/debuginfo/constant-debug-locs.rs b/src/test/debuginfo/constant-debug-locs.rs
index 7a24510b7d4..8fc910d8a6d 100644
--- a/src/test/debuginfo/constant-debug-locs.rs
+++ b/src/test/debuginfo/constant-debug-locs.rs
@@ -15,7 +15,6 @@
 #![allow(dead_code, unused_variables)]
 #![feature(omit_gdb_pretty_printer_section)]
 #![omit_gdb_pretty_printer_section]
-#![feature(const_unsafe_cell_new)]
 #![feature(static_mutex)]
 
 // This test makes sure that the compiler doesn't crash when trying to assign
diff --git a/src/test/run-pass-fulldeps/vector-sort-panic-safe.rs b/src/test/run-pass-fulldeps/vector-sort-panic-safe.rs
index 82305045f80..adc72aa0ea2 100644
--- a/src/test/run-pass-fulldeps/vector-sort-panic-safe.rs
+++ b/src/test/run-pass-fulldeps/vector-sort-panic-safe.rs
@@ -12,7 +12,6 @@
 
 #![feature(rustc_private)]
 #![feature(sort_unstable)]
-#![feature(const_atomic_usize_new)]
 
 extern crate rand;
 
diff --git a/src/test/run-pass-valgrind/cast-enum-with-dtor.rs b/src/test/run-pass-valgrind/cast-enum-with-dtor.rs
index 439c1080f47..4466a95cb39 100644
--- a/src/test/run-pass-valgrind/cast-enum-with-dtor.rs
+++ b/src/test/run-pass-valgrind/cast-enum-with-dtor.rs
@@ -11,7 +11,6 @@
 // no-prefer-dynamic
 
 #![allow(dead_code)]
-#![feature(const_atomic_usize_new)]
 
 // check dtor calling order when casting enums.
 
diff --git a/src/test/run-pass/associated-types-project-from-type-param-via-bound-in-where.rs b/src/test/run-pass/associated-types-project-from-type-param-via-bound-in-where.rs
index 7cde780cc54..5ceb1013ad8 100644
--- a/src/test/run-pass/associated-types-project-from-type-param-via-bound-in-where.rs
+++ b/src/test/run-pass/associated-types-project-from-type-param-via-bound-in-where.rs
@@ -12,8 +12,6 @@
 // `Item` originates in a where-clause, not the declaration of
 // `T`. Issue #20300.
 
-#![feature(const_atomic_usize_new)]
-
 use std::marker::{PhantomData};
 use std::sync::atomic::{AtomicUsize};
 use std::sync::atomic::Ordering::SeqCst;
diff --git a/src/test/run-pass/auxiliary/issue-17718-aux.rs b/src/test/run-pass/auxiliary/issue-17718-aux.rs
index 36891a1ecad..2bc8b4b7ba0 100644
--- a/src/test/run-pass/auxiliary/issue-17718-aux.rs
+++ b/src/test/run-pass/auxiliary/issue-17718-aux.rs
@@ -8,8 +8,6 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#![feature(const_atomic_usize_new)]
-
 use std::sync::atomic;
 
 pub const C1: usize = 1;
diff --git a/src/test/run-pass/auxiliary/thread-local-extern-static.rs b/src/test/run-pass/auxiliary/thread-local-extern-static.rs
index bce87ef5a26..e9457886be8 100644
--- a/src/test/run-pass/auxiliary/thread-local-extern-static.rs
+++ b/src/test/run-pass/auxiliary/thread-local-extern-static.rs
@@ -9,7 +9,6 @@
 // except according to those terms.
 
 #![feature(cfg_target_thread_local, const_fn, thread_local)]
-#![feature(const_cell_new)]
 #![crate_type = "lib"]
 
 #[cfg(target_thread_local)]
diff --git a/src/test/run-pass/box-of-array-of-drop-1.rs b/src/test/run-pass/box-of-array-of-drop-1.rs
index 47b44863a74..db055e6886a 100644
--- a/src/test/run-pass/box-of-array-of-drop-1.rs
+++ b/src/test/run-pass/box-of-array-of-drop-1.rs
@@ -13,8 +13,6 @@
 
 // ignore-emscripten no threads support
 
-#![feature(const_atomic_usize_new)]
-
 use std::thread;
 use std::sync::atomic::{AtomicUsize, Ordering};
 
diff --git a/src/test/run-pass/box-of-array-of-drop-2.rs b/src/test/run-pass/box-of-array-of-drop-2.rs
index 54be4955baf..9dde53bb31d 100644
--- a/src/test/run-pass/box-of-array-of-drop-2.rs
+++ b/src/test/run-pass/box-of-array-of-drop-2.rs
@@ -13,8 +13,6 @@
 
 // ignore-emscripten no threads support
 
-#![feature(const_atomic_usize_new)]
-
 use std::thread;
 use std::sync::atomic::{AtomicUsize, Ordering};
 
diff --git a/src/test/run-pass/const-fn-feature-flags.rs b/src/test/run-pass/const-fn-feature-flags.rs
index 1e27a3edac8..a7736a2eb34 100644
--- a/src/test/run-pass/const-fn-feature-flags.rs
+++ b/src/test/run-pass/const-fn-feature-flags.rs
@@ -8,9 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-// Test use of const fns in std using individual feature gates.
-
-#![feature(const_cell_new)]
+// Test use of stabilized const fns in std formerly using individual feature gates.
 
 use std::cell::Cell;
 
diff --git a/src/test/run-pass/const-size_of-align_of.rs b/src/test/run-pass/const-size_of-align_of.rs
index d5547ea5add..06fbe9bf4f6 100644
--- a/src/test/run-pass/const-size_of-align_of.rs
+++ b/src/test/run-pass/const-size_of-align_of.rs
@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#![feature(const_fn, const_size_of, const_align_of)]
+#![feature(const_fn)]
 
 use std::mem;
 
diff --git a/src/test/run-pass/issue-17718-static-unsafe-interior.rs b/src/test/run-pass/issue-17718-static-unsafe-interior.rs
index 66f70cdaeb0..5f7629fa267 100644
--- a/src/test/run-pass/issue-17718-static-unsafe-interior.rs
+++ b/src/test/run-pass/issue-17718-static-unsafe-interior.rs
@@ -10,9 +10,6 @@
 
 // pretty-expanded FIXME #23616
 
-#![feature(core)]
-#![feature(const_unsafe_cell_new)]
-
 use std::marker;
 use std::cell::UnsafeCell;
 
diff --git a/src/test/run-pass/issue-17718.rs b/src/test/run-pass/issue-17718.rs
index 1b8fbc1ad2f..502e4a81664 100644
--- a/src/test/run-pass/issue-17718.rs
+++ b/src/test/run-pass/issue-17718.rs
@@ -10,10 +10,6 @@
 
 // aux-build:issue-17718-aux.rs
 
-
-#![feature(core)]
-#![feature(const_atomic_usize_new)]
-
 extern crate issue_17718_aux as other;
 
 use std::sync::atomic::{AtomicUsize, Ordering};
diff --git a/src/test/run-pass/issue-21486.rs b/src/test/run-pass/issue-21486.rs
index 23d06c4324d..a61f294465d 100644
--- a/src/test/run-pass/issue-21486.rs
+++ b/src/test/run-pass/issue-21486.rs
@@ -12,8 +12,6 @@
 // created via FRU and control-flow breaks in the middle of
 // construction.
 
-#![feature(const_atomic_usize_new)]
-
 use std::sync::atomic::{Ordering, AtomicUsize};
 
 #[derive(Debug)]
diff --git a/src/test/run-pass/issue-26655.rs b/src/test/run-pass/issue-26655.rs
index 3e252b8629e..6d43451af6b 100644
--- a/src/test/run-pass/issue-26655.rs
+++ b/src/test/run-pass/issue-26655.rs
@@ -12,8 +12,6 @@
 
 // Check that the destructors of simple enums are run on unwinding
 
-#![feature(const_atomic_usize_new)]
-
 use std::sync::atomic::{Ordering, AtomicUsize};
 use std::thread;
 
diff --git a/src/test/run-pass/issue-27997.rs b/src/test/run-pass/issue-27997.rs
index dab42e48e16..9dba477a7e5 100644
--- a/src/test/run-pass/issue-27997.rs
+++ b/src/test/run-pass/issue-27997.rs
@@ -8,8 +8,6 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#![feature(const_atomic_usize_new)]
-
 use std::sync::atomic::{Ordering, AtomicUsize};
 
 use std::mem;
diff --git a/src/test/run-pass/nested-vec-3.rs b/src/test/run-pass/nested-vec-3.rs
index 9141b5f29ce..d1a63b44392 100644
--- a/src/test/run-pass/nested-vec-3.rs
+++ b/src/test/run-pass/nested-vec-3.rs
@@ -14,8 +14,6 @@
 // the contents implement Drop and we hit a panic in the middle of
 // construction.
 
-#![feature(const_atomic_usize_new)]
-
 use std::thread;
 use std::sync::atomic::{AtomicUsize, Ordering};
 
diff --git a/src/test/run-pass/panic-handler-chain.rs b/src/test/run-pass/panic-handler-chain.rs
index c5dc8ccd2ee..8d692f2241b 100644
--- a/src/test/run-pass/panic-handler-chain.rs
+++ b/src/test/run-pass/panic-handler-chain.rs
@@ -11,7 +11,6 @@
 // ignore-emscripten no threads support
 
 #![feature(panic_handler, std_panic)]
-#![feature(const_atomic_usize_new)]
 
 use std::sync::atomic::{AtomicUsize, Ordering};
 use std::panic;
diff --git a/src/test/run-pass/panic-handler-set-twice.rs b/src/test/run-pass/panic-handler-set-twice.rs
index 8bf2683cd9f..81da13afaa5 100644
--- a/src/test/run-pass/panic-handler-set-twice.rs
+++ b/src/test/run-pass/panic-handler-set-twice.rs
@@ -8,7 +8,6 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 #![feature(panic_handler, std_panic)]
-#![feature(const_atomic_usize_new)]
 
 // ignore-emscripten no threads support
 
diff --git a/src/test/run-pass/struct-order-of-eval-3.rs b/src/test/run-pass/struct-order-of-eval-3.rs
index cf93133d205..3059c8e9e89 100644
--- a/src/test/run-pass/struct-order-of-eval-3.rs
+++ b/src/test/run-pass/struct-order-of-eval-3.rs
@@ -11,8 +11,6 @@
 // Checks that functional-record-update order-of-eval is as expected
 // even when no Drop-implementations are involved.
 
-#![feature(const_atomic_usize_new)]
-
 use std::sync::atomic::{Ordering, AtomicUsize};
 
 struct W { wrapped: u32 }
diff --git a/src/test/run-pass/struct-order-of-eval-4.rs b/src/test/run-pass/struct-order-of-eval-4.rs
index d442923478f..2ae9ebc34e1 100644
--- a/src/test/run-pass/struct-order-of-eval-4.rs
+++ b/src/test/run-pass/struct-order-of-eval-4.rs
@@ -11,8 +11,6 @@
 // Checks that struct-literal expression order-of-eval is as expected
 // even when no Drop-implementations are involved.
 
-#![feature(const_atomic_usize_new)]
-
 use std::sync::atomic::{Ordering, AtomicUsize};
 
 struct W { wrapped: u32 }
diff --git a/src/test/ui/span/dropck_arr_cycle_checked.rs b/src/test/ui/span/dropck_arr_cycle_checked.rs
index 995a198271c..455c9dc57f5 100644
--- a/src/test/ui/span/dropck_arr_cycle_checked.rs
+++ b/src/test/ui/span/dropck_arr_cycle_checked.rs
@@ -13,7 +13,7 @@
 //
 // (Compare against compile-fail/dropck_vec_cycle_checked.rs)
 
-#![feature(const_atomic_usize_new)]
+
 
 use std::cell::Cell;
 use id::Id;
diff --git a/src/test/ui/span/dropck_vec_cycle_checked.rs b/src/test/ui/span/dropck_vec_cycle_checked.rs
index 5bcaa71f73c..5e7cb79680c 100644
--- a/src/test/ui/span/dropck_vec_cycle_checked.rs
+++ b/src/test/ui/span/dropck_vec_cycle_checked.rs
@@ -12,7 +12,7 @@
 //
 // (Compare against compile-fail/dropck_arr_cycle_checked.rs)
 
-#![feature(const_atomic_usize_new)]
+
 
 use std::cell::Cell;
 use id::Id;
diff --git a/src/test/ui/span/vec-must-not-hide-type-from-dropck.rs b/src/test/ui/span/vec-must-not-hide-type-from-dropck.rs
index d99f3bb19db..c4596e7c368 100644
--- a/src/test/ui/span/vec-must-not-hide-type-from-dropck.rs
+++ b/src/test/ui/span/vec-must-not-hide-type-from-dropck.rs
@@ -23,7 +23,7 @@
 // conditions above to be satisfied, meaning that if the dropck is
 // sound, it should reject this code.
 
-#![feature(const_atomic_usize_new)]
+
 
 use std::cell::Cell;
 use id::Id;