From a22ad2581487431e549236df1c3b31b3324567e2 Mon Sep 17 00:00:00 2001
From: Brian Anderson <banderson@mozilla.com>
Date: Fri, 24 Apr 2015 14:50:07 -0700
Subject: [PATCH] Fix fallout from wrapping_neg revert

---
 src/libcore/num/mod.rs   | 2 +-
 src/libserialize/json.rs | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/libcore/num/mod.rs b/src/libcore/num/mod.rs
index 89e6330f07b0..1b0dd73d1060 100644
--- a/src/libcore/num/mod.rs
+++ b/src/libcore/num/mod.rs
@@ -506,7 +506,7 @@ macro_rules! int_impl {
         #[inline]
         pub fn abs(self) -> $T {
             if self.is_negative() {
-                self.wrapping_neg()
+                !self + 1 // wrapping_neg
             } else {
                 self
             }
diff --git a/src/libserialize/json.rs b/src/libserialize/json.rs
index f17ce14f9eff..f57b852ea53d 100644
--- a/src/libserialize/json.rs
+++ b/src/libserialize/json.rs
@@ -1538,7 +1538,7 @@ impl<T: Iterator<Item=char>> Parser<T> {
             F64Value(res)
         } else {
             if neg {
-                let res = (res as i64).wrapping_neg();
+                let res = !(res as i64) + 1; // wrapping_neg
 
                 // Make sure we didn't underflow.
                 if res > 0 {