From b8ec7e88fc6c5a81194fd09dad042dc291a1cbb5 Mon Sep 17 00:00:00 2001
From: "Felix S. Klock II" <pnkfelix@pnkfx.org>
Date: Fri, 17 Apr 2015 15:32:30 +0200
Subject: [PATCH] unit test for checked overflow during signed negation.

---
 src/test/run-fail/overflowing-neg.rs | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)
 create mode 100644 src/test/run-fail/overflowing-neg.rs

diff --git a/src/test/run-fail/overflowing-neg.rs b/src/test/run-fail/overflowing-neg.rs
new file mode 100644
index 00000000000..cdb74c7d7e2
--- /dev/null
+++ b/src/test/run-fail/overflowing-neg.rs
@@ -0,0 +1,19 @@
+// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// error-pattern:thread '<main>' panicked at 'attempted to negate with overflow'
+// compile-flags: -C debug-assertions
+
+// (Work around constant-evaluation)
+fn value() -> i8 { std::i8::MIN }
+
+fn main() {
+    let _x = -value();
+}