From 3ed79944e8b5fc69f325db955336aff86e9210e5 Mon Sep 17 00:00:00 2001
From: Philipp Oppermann <dev@phil-opp.com>
Date: Tue, 13 Oct 2015 17:11:49 +0200
Subject: [PATCH] Make Unique::new const function

---
 src/libcore/ptr.rs | 24 ++++++++++++++++++++----
 1 file changed, 20 insertions(+), 4 deletions(-)

diff --git a/src/libcore/ptr.rs b/src/libcore/ptr.rs
index 8adbaf56f14..63057aadf77 100644
--- a/src/libcore/ptr.rs
+++ b/src/libcore/ptr.rs
@@ -498,12 +498,28 @@ unsafe impl<T: Send + ?Sized> Send for Unique<T> { }
 #[unstable(feature = "unique", issue = "27730")]
 unsafe impl<T: Sync + ?Sized> Sync for Unique<T> { }
 
+#[cfg(stage0)]
+macro_rules! unique_new {
+    () => (
+        /// Creates a new `Unique`.
+        pub unsafe fn new(ptr: *mut T) -> Unique<T> {
+            Unique { pointer: NonZero::new(ptr), _marker: PhantomData }
+        }
+    )
+}
+#[cfg(not(stage0))]
+macro_rules! unique_new {
+    () => (
+        /// Creates a new `Unique`.
+        pub unsafe const fn new(ptr: *mut T) -> Unique<T> {
+            Unique { pointer: NonZero::new(ptr), _marker: PhantomData }
+        }
+    )
+}
+
 #[unstable(feature = "unique", issue = "27730")]
 impl<T: ?Sized> Unique<T> {
-    /// Creates a new `Unique`.
-    pub unsafe fn new(ptr: *mut T) -> Unique<T> {
-        Unique { pointer: NonZero::new(ptr), _marker: PhantomData }
-    }
+    unique_new!{}
 
     /// Dereferences the content.
     pub unsafe fn get(&self) -> &T {