Add test case.

src/test/compile-fail/lint-attr-non-item-node.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.
+
+// Checks that lint attributes work on non-item AST nodes
+
+fn main() {
+    #[deny(unreachable_code)]
+    loop {
+        break;
+        "unreachable"; //~ ERROR unreachable statement
+    }
+}