cherry-pick over the tests I wrote for the reachability code

For the most part, the current code performs similarly, although it
differs in some particulars. I'll be nice to have these tests for
judging future changes, as well.

1 files changed, 28 insertions, 0 deletions

diff --git a/src/test/ui/reachable/expr_array.rs b/src/test/ui/reachable/expr_array.rs
new file mode 100644
index 00000000000..00e8be07725
--- /dev/null
+++ b/src/test/ui/reachable/expr_array.rs
@@ -0,0 +1,28 @@
+// 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.
+
+#![allow(unused_variables)]
+#![allow(unused_assignments)]
+#![allow(dead_code)]
+#![deny(unreachable_code)]
+#![feature(never_type)]
+#![feature(type_ascription)]
+
+fn a() {
+    // the `22` is unreachable:
+    let x: [usize; 2] = [return, 22];
+}
+
+fn b() {
+    // the `array is unreachable:
+    let x: [usize; 2] = [22, return];
+}
+
+fn main() { }