From e9f892acc44f37887fe1b9f3039ba6efdfc2154e Mon Sep 17 00:00:00 2001
From: "Felix S. Klock II" <pnkfelix@pnkfx.org>
Date: Wed, 15 Apr 2015 12:27:23 +0200
Subject: [PATCH] side-step potentially panic'ing negate in `fn abs`.

---
 src/libcore/num/mod.rs | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/libcore/num/mod.rs b/src/libcore/num/mod.rs
index c7714afc4fa..a056e585fee 100644
--- a/src/libcore/num/mod.rs
+++ b/src/libcore/num/mod.rs
@@ -1321,7 +1321,11 @@ pub fn pow(self, mut exp: u32) -> $T {
         #[stable(feature = "rust1", since = "1.0.0")]
         #[inline]
         pub fn abs(self) -> $T {
-            if self.is_negative() { -self } else { self }
+            if self.is_negative() {
+                self.wrapping_neg()
+            } else {
+                self
+            }
         }
 
         /// Returns a number representing sign of `self`.