From 62cf2445633c03a927b7fef4abe82ea480df4078 Mon Sep 17 00:00:00 2001
From: Albin Hedman <albin9604@gmail.com>
Date: Sat, 13 Mar 2021 19:45:48 +0100
Subject: [PATCH] Constify copy_to and copy_from

---
 library/core/src/ptr/const_ptr.rs |  6 ++++--
 library/core/src/ptr/mut_ptr.rs   | 12 ++++++++----
 2 files changed, 12 insertions(+), 6 deletions(-)

diff --git a/library/core/src/ptr/const_ptr.rs b/library/core/src/ptr/const_ptr.rs
index 62ca07fc5a4..b511466acd6 100644
--- a/library/core/src/ptr/const_ptr.rs
+++ b/library/core/src/ptr/const_ptr.rs
@@ -819,9 +819,10 @@ pub unsafe fn read_volatile(self) -> T
     /// See [`ptr::copy`] for safety concerns and examples.
     ///
     /// [`ptr::copy`]: crate::ptr::copy()
+    #[rustc_const_unstable(feature = "const_intrinsic_copy", issue = "80697")]
     #[stable(feature = "pointer_methods", since = "1.26.0")]
     #[inline]
-    pub unsafe fn copy_to(self, dest: *mut T, count: usize)
+    pub const unsafe fn copy_to(self, dest: *mut T, count: usize)
     where
         T: Sized,
     {
@@ -837,9 +838,10 @@ pub unsafe fn copy_to(self, dest: *mut T, count: usize)
     /// See [`ptr::copy_nonoverlapping`] for safety concerns and examples.
     ///
     /// [`ptr::copy_nonoverlapping`]: crate::ptr::copy_nonoverlapping()
+    #[rustc_const_unstable(feature = "const_intrinsic_copy", issue = "80697")]
     #[stable(feature = "pointer_methods", since = "1.26.0")]
     #[inline]
-    pub unsafe fn copy_to_nonoverlapping(self, dest: *mut T, count: usize)
+    pub const unsafe fn copy_to_nonoverlapping(self, dest: *mut T, count: usize)
     where
         T: Sized,
     {
diff --git a/library/core/src/ptr/mut_ptr.rs b/library/core/src/ptr/mut_ptr.rs
index a365b66d8fc..fa09cf85435 100644
--- a/library/core/src/ptr/mut_ptr.rs
+++ b/library/core/src/ptr/mut_ptr.rs
@@ -926,9 +926,10 @@ pub unsafe fn read_volatile(self) -> T
     /// See [`ptr::copy`] for safety concerns and examples.
     ///
     /// [`ptr::copy`]: crate::ptr::copy()
+    #[rustc_const_unstable(feature = "const_intrinsic_copy", issue = "80697")]
     #[stable(feature = "pointer_methods", since = "1.26.0")]
     #[inline]
-    pub unsafe fn copy_to(self, dest: *mut T, count: usize)
+    pub const unsafe fn copy_to(self, dest: *mut T, count: usize)
     where
         T: Sized,
     {
@@ -944,9 +945,10 @@ pub unsafe fn copy_to(self, dest: *mut T, count: usize)
     /// See [`ptr::copy_nonoverlapping`] for safety concerns and examples.
     ///
     /// [`ptr::copy_nonoverlapping`]: crate::ptr::copy_nonoverlapping()
+    #[rustc_const_unstable(feature = "const_intrinsic_copy", issue = "80697")]
     #[stable(feature = "pointer_methods", since = "1.26.0")]
     #[inline]
-    pub unsafe fn copy_to_nonoverlapping(self, dest: *mut T, count: usize)
+    pub const unsafe fn copy_to_nonoverlapping(self, dest: *mut T, count: usize)
     where
         T: Sized,
     {
@@ -962,9 +964,10 @@ pub unsafe fn copy_to_nonoverlapping(self, dest: *mut T, count: usize)
     /// See [`ptr::copy`] for safety concerns and examples.
     ///
     /// [`ptr::copy`]: crate::ptr::copy()
+    #[rustc_const_unstable(feature = "const_intrinsic_copy", issue = "80697")]
     #[stable(feature = "pointer_methods", since = "1.26.0")]
     #[inline]
-    pub unsafe fn copy_from(self, src: *const T, count: usize)
+    pub const unsafe fn copy_from(self, src: *const T, count: usize)
     where
         T: Sized,
     {
@@ -980,9 +983,10 @@ pub unsafe fn copy_from(self, src: *const T, count: usize)
     /// See [`ptr::copy_nonoverlapping`] for safety concerns and examples.
     ///
     /// [`ptr::copy_nonoverlapping`]: crate::ptr::copy_nonoverlapping()
+    #[rustc_const_unstable(feature = "const_intrinsic_copy", issue = "80697")]
     #[stable(feature = "pointer_methods", since = "1.26.0")]
     #[inline]
-    pub unsafe fn copy_from_nonoverlapping(self, src: *const T, count: usize)
+    pub const unsafe fn copy_from_nonoverlapping(self, src: *const T, count: usize)
     where
         T: Sized,
     {