From 9835e2ae736235810b4ea1c162ca5e65c547e770 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sat, 18 May 2024 04:49:50 +0200
Subject: Merging upstream version 1.71.1+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 library/core/src/ptr/non_null.rs | 30 +++++++++++++++++++-----------
 1 file changed, 19 insertions(+), 11 deletions(-)

(limited to 'library/core/src/ptr/non_null.rs')

diff --git a/library/core/src/ptr/non_null.rs b/library/core/src/ptr/non_null.rs
index 13f56c0ce..b492d2f07 100644
--- a/library/core/src/ptr/non_null.rs
+++ b/library/core/src/ptr/non_null.rs
@@ -449,6 +449,19 @@ impl<T: ?Sized> NonNull<T> {
         // SAFETY: `self` is a `NonNull` pointer which is necessarily non-null
         unsafe { NonNull::new_unchecked(self.as_ptr() as *mut U) }
     }
+
+    /// See [`pointer::add`] for semantics and safety requirements.
+    #[inline]
+    pub(crate) const unsafe fn add(self, delta: usize) -> Self
+    where
+        T: Sized,
+    {
+        // SAFETY: We require that the delta stays in-bounds of the object, and
+        // thus it cannot become null, as that would require wrapping the
+        // address space, which no legal objects are allowed to do.
+        // And the caller promised the `delta` is sound to add.
+        unsafe { NonNull { pointer: self.pointer.add(delta) } }
+    }
 }
 
 impl<T> NonNull<[T]> {
@@ -676,11 +689,10 @@ impl<T> NonNull<[T]> {
     /// }
     /// ```
     #[unstable(feature = "slice_ptr_get", issue = "74265")]
-    #[rustc_const_unstable(feature = "const_slice_index", issue = "none")]
     #[inline]
-    pub const unsafe fn get_unchecked_mut<I>(self, index: I) -> NonNull<I::Output>
+    pub unsafe fn get_unchecked_mut<I>(self, index: I) -> NonNull<I::Output>
     where
-        I: ~const SliceIndex<[T]>,
+        I: SliceIndex<[T]>,
     {
         // SAFETY: the caller ensures that `self` is dereferenceable and `index` in-bounds.
         // As a consequence, the resulting pointer cannot be null.
@@ -689,8 +701,7 @@ impl<T> NonNull<[T]> {
 }
 
 #[stable(feature = "nonnull", since = "1.25.0")]
-#[rustc_const_unstable(feature = "const_clone", issue = "91805")]
-impl<T: ?Sized> const Clone for NonNull<T> {
+impl<T: ?Sized> Clone for NonNull<T> {
     #[inline(always)]
     fn clone(&self) -> Self {
         *self
@@ -756,8 +767,7 @@ impl<T: ?Sized> hash::Hash for NonNull<T> {
 }
 
 #[unstable(feature = "ptr_internals", issue = "none")]
-#[rustc_const_unstable(feature = "const_convert", issue = "88674")]
-impl<T: ?Sized> const From<Unique<T>> for NonNull<T> {
+impl<T: ?Sized> From<Unique<T>> for NonNull<T> {
     #[inline]
     fn from(unique: Unique<T>) -> Self {
         // SAFETY: A Unique pointer cannot be null, so the conditions for
@@ -767,8 +777,7 @@ impl<T: ?Sized> const From<Unique<T>> for NonNull<T> {
 }
 
 #[stable(feature = "nonnull", since = "1.25.0")]
-#[rustc_const_unstable(feature = "const_convert", issue = "88674")]
-impl<T: ?Sized> const From<&mut T> for NonNull<T> {
+impl<T: ?Sized> From<&mut T> for NonNull<T> {
     /// Converts a `&mut T` to a `NonNull<T>`.
     ///
     /// This conversion is safe and infallible since references cannot be null.
@@ -780,8 +789,7 @@ impl<T: ?Sized> const From<&mut T> for NonNull<T> {
 }
 
 #[stable(feature = "nonnull", since = "1.25.0")]
-#[rustc_const_unstable(feature = "const_convert", issue = "88674")]
-impl<T: ?Sized> const From<&T> for NonNull<T> {
+impl<T: ?Sized> From<&T> for NonNull<T> {
     /// Converts a `&T` to a `NonNull<T>`.
     ///
     /// This conversion is safe and infallible since references cannot be null.
-- 
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