From 5e7785cabc1c1bfb0efb2d99de5eda173fd146de Mon Sep 17 00:00:00 2001
From: "Felix S. Klock II" <pnkfelix@pnkfx.org>
Date: Thu, 16 Apr 2015 16:48:14 +0200
Subject: [PATCH] Workaround deliberate overflowing negation in
 serialize::json.

---
 src/libserialize/json.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/libserialize/json.rs b/src/libserialize/json.rs
index 8f020d0857d..b4f679a8109 100644
--- a/src/libserialize/json.rs
+++ b/src/libserialize/json.rs
@@ -1540,7 +1540,7 @@ impl<T: Iterator<Item=char>> Parser<T> {
             F64Value(res)
         } else {
             if neg {
-                let res = -(res as i64);
+                let res = (res as i64).wrapping_neg();
 
                 // Make sure we didn't underflow.
                 if res > 0 {