Fix const stability since versions.

library/alloc/src/string.rs

@@ -360,7 +360,7 @@ impl String {
     /// let s = String::new();
     /// ```
     #[inline]
-    #[rustc_const_stable(feature = "const_string_new", since = "1.32.0")]
+    #[rustc_const_stable(feature = "const_string_new", since = "1.39.0")]
     #[stable(feature = "rust1", since = "1.0.0")]
     pub const fn new() -> String {
         String { vec: Vec::new() }

library/core/src/alloc/layout.rs

@@ -93,7 +93,7 @@ impl Layout {
     /// This function is unsafe as it does not verify the preconditions from
     /// [`Layout::from_size_align`].
     #[stable(feature = "alloc_layout", since = "1.28.0")]
-    #[rustc_const_stable(feature = "alloc_layout", since = "1.28.0")]
+    #[rustc_const_stable(feature = "alloc_layout", since = "1.36.0")]
     #[inline]
     pub const unsafe fn from_size_align_unchecked(size: usize, align: usize) -> Self {
         // SAFETY: the caller must ensure that `align` is greater than zero.

library/core/src/cell.rs

@@ -325,7 +325,7 @@ impl<T> Cell<T> {
     /// let c = Cell::new(5);
     /// ```
     #[stable(feature = "rust1", since = "1.0.0")]
-    #[rustc_const_stable(feature = "const_cell_new", since = "1.32.0")]
+    #[rustc_const_stable(feature = "const_cell_new", since = "1.24.0")]
     #[inline]
     pub const fn new(value: T) -> Cell<T> {
         Cell { value: UnsafeCell::new(value) }
@@ -655,7 +655,7 @@ impl<T> RefCell<T> {
     /// let c = RefCell::new(5);
     /// ```
     #[stable(feature = "rust1", since = "1.0.0")]
-    #[rustc_const_stable(feature = "const_refcell_new", since = "1.32.0")]
+    #[rustc_const_stable(feature = "const_refcell_new", since = "1.24.0")]
     #[inline]
     pub const fn new(value: T) -> RefCell<T> {
         RefCell { value: UnsafeCell::new(value), borrow: Cell::new(UNUSED) }

library/core/src/mem/mod.rs

@@ -297,7 +297,7 @@ pub fn forget_unsized<T: ?Sized>(t: T) {
 #[inline(always)]
 #[stable(feature = "rust1", since = "1.0.0")]
 #[rustc_promotable]
-#[rustc_const_stable(feature = "const_size_of", since = "1.32.0")]
+#[rustc_const_stable(feature = "const_size_of", since = "1.24.0")]
 pub const fn size_of<T>() -> usize {
     intrinsics::size_of::<T>()
 }
@@ -440,7 +440,7 @@ pub fn min_align_of_val<T: ?Sized>(val: &T) -> usize {
 #[inline(always)]
 #[stable(feature = "rust1", since = "1.0.0")]
 #[rustc_promotable]
-#[rustc_const_stable(feature = "const_align_of", since = "1.32.0")]
+#[rustc_const_stable(feature = "const_align_of", since = "1.24.0")]
 pub const fn align_of<T>() -> usize {
     intrinsics::min_align_of::<T>()
 }

library/core/src/ptr/mod.rs

@@ -205,7 +205,7 @@ pub unsafe fn drop_in_place<T: ?Sized>(to_drop: *mut T) {
 #[inline(always)]
 #[stable(feature = "rust1", since = "1.0.0")]
 #[rustc_promotable]
-#[rustc_const_stable(feature = "const_ptr_null", since = "1.32.0")]
+#[rustc_const_stable(feature = "const_ptr_null", since = "1.24.0")]
 pub const fn null<T>() -> *const T {
     0 as *const T
 }
@@ -223,7 +223,7 @@ pub const fn null<T>() -> *const T {
 #[inline(always)]
 #[stable(feature = "rust1", since = "1.0.0")]
 #[rustc_promotable]
-#[rustc_const_stable(feature = "const_ptr_null", since = "1.32.0")]
+#[rustc_const_stable(feature = "const_ptr_null", since = "1.24.0")]
 pub const fn null_mut<T>() -> *mut T {
     0 as *mut T
 }

library/core/src/ptr/non_null.rs

@@ -72,7 +72,7 @@ impl<T: Sized> NonNull<T> {
     /// sentinel value. Types that lazily allocate must track initialization by
     /// some other means.
     #[stable(feature = "nonnull", since = "1.25.0")]
-    #[rustc_const_stable(feature = "const_nonnull_dangling", since = "1.32.0")]
+    #[rustc_const_stable(feature = "const_nonnull_dangling", since = "1.36.0")]
     #[inline]
     pub const fn dangling() -> Self {
         // SAFETY: mem::align_of() returns a non-zero usize which is then casted
@@ -156,7 +156,7 @@ impl<T: ?Sized> NonNull<T> {
     ///
     /// `ptr` must be non-null.
     #[stable(feature = "nonnull", since = "1.25.0")]
-    #[rustc_const_stable(feature = "const_nonnull_new_unchecked", since = "1.32.0")]
+    #[rustc_const_stable(feature = "const_nonnull_new_unchecked", since = "1.25.0")]
     #[inline]
     pub const unsafe fn new_unchecked(ptr: *mut T) -> Self {
         // SAFETY: the caller must guarantee that `ptr` is non-null.
@@ -288,7 +288,7 @@ impl<T: ?Sized> NonNull<T> {
 
     /// Casts to a pointer of another type.
     #[stable(feature = "nonnull_cast", since = "1.27.0")]
-    #[rustc_const_stable(feature = "const_nonnull_cast", since = "1.32.0")]
+    #[rustc_const_stable(feature = "const_nonnull_cast", since = "1.36.0")]
     #[inline]
     pub const fn cast<U>(self) -> NonNull<U> {
         // SAFETY: `self` is a `NonNull` pointer which is necessarily non-null

library/core/src/slice/mod.rs

@@ -94,7 +94,7 @@ impl<T> [T] {
     /// ```
     #[doc(alias = "length")]
     #[stable(feature = "rust1", since = "1.0.0")]
-    #[rustc_const_stable(feature = "const_slice_len", since = "1.32.0")]
+    #[rustc_const_stable(feature = "const_slice_len", since = "1.39.0")]
     #[inline]
     // SAFETY: const sound because we transmute out the length field as a usize (which it must be)
     #[rustc_allow_const_fn_unstable(const_fn_union)]
@@ -127,7 +127,7 @@ impl<T> [T] {
     /// assert!(!a.is_empty());
     /// ```
     #[stable(feature = "rust1", since = "1.0.0")]
-    #[rustc_const_stable(feature = "const_slice_is_empty", since = "1.32.0")]
+    #[rustc_const_stable(feature = "const_slice_is_empty", since = "1.39.0")]
     #[inline]
     pub const fn is_empty(&self) -> bool {
         self.len() == 0

library/core/src/str/mod.rs

@@ -140,7 +140,7 @@ impl str {
     /// ```
     #[doc(alias = "length")]
     #[stable(feature = "rust1", since = "1.0.0")]
-    #[rustc_const_stable(feature = "const_str_len", since = "1.32.0")]
+    #[rustc_const_stable(feature = "const_str_len", since = "1.39.0")]
     #[inline]
     pub const fn len(&self) -> usize {
         self.as_bytes().len()
@@ -161,7 +161,7 @@ impl str {
     /// ```
     #[inline]
     #[stable(feature = "rust1", since = "1.0.0")]
-    #[rustc_const_stable(feature = "const_str_is_empty", since = "1.32.0")]
+    #[rustc_const_stable(feature = "const_str_is_empty", since = "1.39.0")]
     pub const fn is_empty(&self) -> bool {
         self.len() == 0
     }
@@ -217,7 +217,7 @@ impl str {
     /// assert_eq!(b"bors", bytes);
     /// ```
     #[stable(feature = "rust1", since = "1.0.0")]
-    #[rustc_const_stable(feature = "str_as_bytes", since = "1.32.0")]
+    #[rustc_const_stable(feature = "str_as_bytes", since = "1.39.0")]
     #[inline(always)]
     #[allow(unused_attributes)]
     #[rustc_allow_const_fn_unstable(const_fn_transmute)]

library/core/src/sync/atomic.rs

@@ -283,7 +283,7 @@ impl AtomicBool {
     /// ```
     #[inline]
     #[stable(feature = "rust1", since = "1.0.0")]
-    #[rustc_const_stable(feature = "const_atomic_new", since = "1.32.0")]
+    #[rustc_const_stable(feature = "const_atomic_new", since = "1.24.0")]
     pub const fn new(v: bool) -> AtomicBool {
         AtomicBool { v: UnsafeCell::new(v as u8) }
     }
@@ -883,7 +883,7 @@ impl<T> AtomicPtr<T> {
     /// ```
     #[inline]
     #[stable(feature = "rust1", since = "1.0.0")]
-    #[rustc_const_stable(feature = "const_atomic_new", since = "1.32.0")]
+    #[rustc_const_stable(feature = "const_atomic_new", since = "1.24.0")]
     pub const fn new(p: *mut T) -> AtomicPtr<T> {
         AtomicPtr { p: UnsafeCell::new(p) }
     }
@@ -2276,7 +2276,7 @@ macro_rules! atomic_int_ptr_sized {
             stable(feature = "atomic_access", since = "1.15.0"),
             stable(feature = "atomic_from", since = "1.23.0"),
             stable(feature = "atomic_nand", since = "1.27.0"),
-            rustc_const_stable(feature = "const_integer_atomics", since = "1.34.0"),
+            rustc_const_stable(feature = "const_integer_atomics", since = "1.24.0"),
             stable(feature = "rust1", since = "1.0.0"),
             "isize",
             "",
@@ -2296,7 +2296,7 @@ macro_rules! atomic_int_ptr_sized {
             stable(feature = "atomic_access", since = "1.15.0"),
             stable(feature = "atomic_from", since = "1.23.0"),
             stable(feature = "atomic_nand", since = "1.27.0"),
-            rustc_const_stable(feature = "const_integer_atomics", since = "1.34.0"),
+            rustc_const_stable(feature = "const_integer_atomics", since = "1.24.0"),
             stable(feature = "rust1", since = "1.0.0"),
             "usize",
             "",