drop some const unstables, due to revert no longer possible
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@ -682,8 +682,7 @@ pub unsafe fn uninitialized<T>() -> T {
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/// ```
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/// ```
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#[inline]
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#[inline]
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#[stable(feature = "rust1", since = "1.0.0")]
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#[stable(feature = "rust1", since = "1.0.0")]
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#[rustc_const_unstable(feature = "const_swap", issue = "83163")]
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pub fn swap<T>(x: &mut T, y: &mut T) {
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pub const fn swap<T>(x: &mut T, y: &mut T) {
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// SAFETY: the raw pointers have been created from safe mutable references satisfying all the
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// SAFETY: the raw pointers have been created from safe mutable references satisfying all the
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// constraints on `ptr::swap_nonoverlapping_one`
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// constraints on `ptr::swap_nonoverlapping_one`
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unsafe {
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unsafe {
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@ -813,8 +812,7 @@ pub fn take<T: Default>(dest: &mut T) -> T {
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#[inline]
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#[inline]
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#[stable(feature = "rust1", since = "1.0.0")]
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#[stable(feature = "rust1", since = "1.0.0")]
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#[must_use = "if you don't need the old value, you can just assign the new value directly"]
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#[must_use = "if you don't need the old value, you can just assign the new value directly"]
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#[rustc_const_unstable(feature = "const_replace", issue = "83164")]
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pub fn replace<T>(dest: &mut T, src: T) -> T {
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pub const fn replace<T>(dest: &mut T, src: T) -> T {
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// SAFETY: We read from `dest` but directly write `src` into it afterwards,
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// SAFETY: We read from `dest` but directly write `src` into it afterwards,
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// such that the old value is not duplicated. Nothing is dropped and
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// such that the old value is not duplicated. Nothing is dropped and
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// nothing here can panic.
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// nothing here can panic.
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@ -463,8 +463,7 @@ pub const unsafe fn swap_nonoverlapping<T>(x: *mut T, y: *mut T, count: usize) {
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}
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}
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#[inline]
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#[inline]
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#[rustc_const_unstable(feature = "const_swap", issue = "83163")]
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pub(crate) unsafe fn swap_nonoverlapping_one<T>(x: *mut T, y: *mut T) {
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pub(crate) const unsafe fn swap_nonoverlapping_one<T>(x: *mut T, y: *mut T) {
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// For types smaller than the block optimization below,
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// For types smaller than the block optimization below,
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// just swap directly to avoid pessimizing codegen.
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// just swap directly to avoid pessimizing codegen.
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if mem::size_of::<T>() < 32 {
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if mem::size_of::<T>() < 32 {
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@ -1013,9 +1013,8 @@ impl<T: ?Sized> *mut T {
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///
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///
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/// [`ptr::write`]: crate::ptr::write()
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/// [`ptr::write`]: crate::ptr::write()
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#[stable(feature = "pointer_methods", since = "1.26.0")]
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#[stable(feature = "pointer_methods", since = "1.26.0")]
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#[rustc_const_unstable(feature = "const_ptr_write", issue = "none")]
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#[inline]
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#[inline]
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pub const unsafe fn write(self, val: T)
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pub unsafe fn write(self, val: T)
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where
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where
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T: Sized,
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T: Sized,
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{
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{
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