From b8ffc8a3d8c181e958d2ddf4f108f0cd3a108013 Mon Sep 17 00:00:00 2001
From: Simon Sapin <simon.sapin@exyr.org>
Date: Sun, 21 Jan 2018 09:56:33 +0100
Subject: [PATCH] Add an unstable `cast<U>() -> NonNull<U>` method to
 `NonNull<T>`.

This is less verbose than going through raw pointers to cast with `as`.
---
 src/libcore/ptr.rs | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/libcore/ptr.rs b/src/libcore/ptr.rs
index a0d716fb574..3d84e910fe6 100644
--- a/src/libcore/ptr.rs
+++ b/src/libcore/ptr.rs
@@ -2553,6 +2553,14 @@ impl<T: ?Sized> NonNull<T> {
     pub unsafe fn as_mut(&mut self) -> &mut T {
         &mut *self.as_ptr()
     }
+
+    /// Cast to a pointer of another type
+    #[unstable(feature = "nonnull_cast", issue = "47653")]
+    pub fn cast<U>(self) -> NonNull<U> {
+        unsafe {
+            NonNull::new_unchecked(self.as_ptr() as *mut U)
+        }
+    }
 }
 
 #[stable(feature = "nonnull", since = "1.25.0")]