Stabilize const-calling existing const-fns in std

Fixes rust-lang#46038

Author: SimonSapin

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 }

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::*;

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>() }
 }

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)

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 }
 

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 }
     }

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"),

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;
 

src/librustc/lib.rs

@@ -64,7 +64,6 @@
 #![feature(underscore_lifetimes)]
 #![feature(trace_macros)]
 #![feature(test)]
-#![feature(const_atomic_bool_new)]
 
 #![recursion_limit="512"]
 

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)]

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;

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;

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;
 

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;
 

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]

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),

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;