From dc0db358abe19481e475e10c32149b53370f1a1c Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Thu, 30 May 2024 05:57:31 +0200
Subject: Merging upstream version 1.72.1+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 library/core/src/ptr/const_ptr.rs | 11 ++---------
 library/core/src/ptr/metadata.rs  |  3 ++-
 library/core/src/ptr/mod.rs       |  1 +
 library/core/src/ptr/mut_ptr.rs   | 22 ++--------------------
 library/core/src/ptr/unique.rs    |  2 ++
 5 files changed, 9 insertions(+), 30 deletions(-)

(limited to 'library/core/src/ptr')

diff --git a/library/core/src/ptr/const_ptr.rs b/library/core/src/ptr/const_ptr.rs
index 6e1e862d3..926189a17 100644
--- a/library/core/src/ptr/const_ptr.rs
+++ b/library/core/src/ptr/const_ptr.rs
@@ -104,6 +104,7 @@ impl<T: ?Sized> *const T {
     /// refactored.
     #[stable(feature = "ptr_const_cast", since = "1.65.0")]
     #[rustc_const_stable(feature = "ptr_const_cast", since = "1.65.0")]
+    #[rustc_diagnostic_item = "ptr_cast_mut"]
     #[inline(always)]
     pub const fn cast_mut(self) -> *mut T {
         self as _
@@ -916,16 +917,8 @@ impl<T: ?Sized> *const T {
     where
         T: Sized,
     {
-        #[cfg(bootstrap)]
         // SAFETY: the caller must uphold the safety contract for `offset`.
-        unsafe {
-            self.offset(count as isize)
-        }
-        #[cfg(not(bootstrap))]
-        // SAFETY: the caller must uphold the safety contract for `offset`.
-        unsafe {
-            intrinsics::offset(self, count)
-        }
+        unsafe { intrinsics::offset(self, count) }
     }
 
     /// Calculates the offset from a pointer in bytes (convenience for `.byte_offset(count as isize)`).
diff --git a/library/core/src/ptr/metadata.rs b/library/core/src/ptr/metadata.rs
index 2ea032d4a..daaa44b1d 100644
--- a/library/core/src/ptr/metadata.rs
+++ b/library/core/src/ptr/metadata.rs
@@ -50,7 +50,8 @@ use crate::hash::{Hash, Hasher};
 ///
 /// [`to_raw_parts`]: *const::to_raw_parts
 #[lang = "pointee_trait"]
-#[rustc_deny_explicit_impl]
+#[cfg_attr(not(bootstrap), rustc_deny_explicit_impl(implement_via_object = false))]
+#[cfg_attr(bootstrap, rustc_deny_explicit_impl)]
 pub trait Pointee {
     /// The type for metadata in pointers and references to `Self`.
     #[lang = "metadata_type"]
diff --git a/library/core/src/ptr/mod.rs b/library/core/src/ptr/mod.rs
index d0cb2f715..acc9ca29d 100644
--- a/library/core/src/ptr/mod.rs
+++ b/library/core/src/ptr/mod.rs
@@ -698,6 +698,7 @@ where
 #[inline(always)]
 #[must_use]
 #[unstable(feature = "ptr_from_ref", issue = "106116")]
+#[rustc_diagnostic_item = "ptr_from_ref"]
 pub const fn from_ref<T: ?Sized>(r: &T) -> *const T {
     r
 }
diff --git a/library/core/src/ptr/mut_ptr.rs b/library/core/src/ptr/mut_ptr.rs
index 2fe5164c3..c6f438578 100644
--- a/library/core/src/ptr/mut_ptr.rs
+++ b/library/core/src/ptr/mut_ptr.rs
@@ -473,20 +473,10 @@ impl<T: ?Sized> *mut T {
     where
         T: Sized,
     {
-        #[cfg(bootstrap)]
         // SAFETY: the caller must uphold the safety contract for `offset`.
         // The obtained pointer is valid for writes since the caller must
         // guarantee that it points to the same allocated object as `self`.
-        unsafe {
-            intrinsics::offset(self, count) as *mut T
-        }
-        #[cfg(not(bootstrap))]
-        // SAFETY: the caller must uphold the safety contract for `offset`.
-        // The obtained pointer is valid for writes since the caller must
-        // guarantee that it points to the same allocated object as `self`.
-        unsafe {
-            intrinsics::offset(self, count)
-        }
+        unsafe { intrinsics::offset(self, count) }
     }
 
     /// Calculates the offset from a pointer in bytes.
@@ -1026,16 +1016,8 @@ impl<T: ?Sized> *mut T {
     where
         T: Sized,
     {
-        #[cfg(bootstrap)]
-        // SAFETY: the caller must uphold the safety contract for `offset`.
-        unsafe {
-            self.offset(count as isize)
-        }
-        #[cfg(not(bootstrap))]
         // SAFETY: the caller must uphold the safety contract for `offset`.
-        unsafe {
-            intrinsics::offset(self, count)
-        }
+        unsafe { intrinsics::offset(self, count) }
     }
 
     /// Calculates the offset from a pointer in bytes (convenience for `.byte_offset(count as isize)`).
diff --git a/library/core/src/ptr/unique.rs b/library/core/src/ptr/unique.rs
index a853f15ed..ff7e91d3e 100644
--- a/library/core/src/ptr/unique.rs
+++ b/library/core/src/ptr/unique.rs
@@ -32,6 +32,8 @@ use crate::ptr::NonNull;
 )]
 #[doc(hidden)]
 #[repr(transparent)]
+// Lang item used experimentally by Miri to define the semantics of `Unique`.
+#[cfg_attr(not(bootstrap), lang = "ptr_unique")]
 pub struct Unique<T: ?Sized> {
     pointer: NonNull<T>,
     // NOTE: this marker has no consequences for variance, but is necessary
-- 
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