From 19fd7fcce90fe41edd4a25f1f9d3cd90d7e285bb Mon Sep 17 00:00:00 2001
From: Matthew Piziak <matthew.piziak@gmail.com>
Date: Mon, 12 Sep 2016 11:23:02 -0400
Subject: [PATCH] add run-fail tests

---
 src/test/run-fail/iter-step-overflow-debug.rs | 27 +++++++++++++++++++
 .../run-fail/iter-step-overflow-ndebug.rs     | 19 +++++++++++++
 2 files changed, 46 insertions(+)
 create mode 100644 src/test/run-fail/iter-step-overflow-debug.rs
 create mode 100644 src/test/run-fail/iter-step-overflow-ndebug.rs

diff --git a/src/test/run-fail/iter-step-overflow-debug.rs b/src/test/run-fail/iter-step-overflow-debug.rs
new file mode 100644
index 000000000000..fad03adfdab2
--- /dev/null
+++ b/src/test/run-fail/iter-step-overflow-debug.rs
@@ -0,0 +1,27 @@
+// Copyright 2016 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.
+
+// compile-flags: -C debug_assertions=yes
+
+use std::panic;
+
+fn main() {
+    let r = panic::catch_unwind(|| {
+        let mut it = u8::MAX..;
+        it.next();
+    });
+    assert!(r.is_err());
+
+    let r = panic::catch_unwind(|| {
+        let mut it = i8::MAX..;
+        it.next();
+    });
+    assert!(r.is_err());
+}
diff --git a/src/test/run-fail/iter-step-overflow-ndebug.rs b/src/test/run-fail/iter-step-overflow-ndebug.rs
new file mode 100644
index 000000000000..718c3e3c533b
--- /dev/null
+++ b/src/test/run-fail/iter-step-overflow-ndebug.rs
@@ -0,0 +1,19 @@
+// Copyright 2016 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.
+
+// compile-flags: -C debug_assertions=no
+
+fn main() {
+    let mut it = u8::MAX..;
+    assert_eq!(it.next(), u8::MIN);
+
+    let mut it = i8::MAX..;
+    assert_eq!(it.next(), i8::MIN);
+}