From 8a8c432f7471a76bdb9179fe622968f6eb381c85 Mon Sep 17 00:00:00 2001
From: Michael Howell <michael@notriddle.com>
Date: Sun, 17 Apr 2016 21:57:11 -0700
Subject: [PATCH] Implement negation for wrapping numerals.

Fixes #33037
---
 src/libcore/num/wrapping.rs | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/libcore/num/wrapping.rs b/src/libcore/num/wrapping.rs
index e28a36af2f322..04e8bc4913bdc 100644
--- a/src/libcore/num/wrapping.rs
+++ b/src/libcore/num/wrapping.rs
@@ -275,6 +275,15 @@ macro_rules! wrapping_impl {
                 *self = *self & other;
             }
         }
+
+        #[stable(feature = "wrapping_neg", since = "1.10.0")]
+        impl Neg for Wrapping<$t> {
+            type Output = Self;
+            #[inline(always)]
+            fn neg(self) -> Self {
+                Wrapping(0) - self
+            }
+        }
     )*)
 }