Add another test for !

Author: canndrew

src/test/run-pass/impl-for-never.rs

@@ -0,0 +1,34 @@
+// Copyright 2012 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.
+
+#![feature(never_type)]
+
+trait StringifyType {
+    fn stringify_type() -> &'static str;
+}
+
+impl StringifyType for ! {
+    fn stringify_type() -> &'static str {
+        "!"
+    }
+}
+
+fn maybe_stringify<T: StringifyType>(opt: Option<T>) -> &'static str {
+    match opt {
+        Some(_) => T::stringify_type(),
+        None => "none",
+    } 
+}
+
+fn main() {
+    println!("! is {}", <!>::stringify_type());
+    println!("None is {}", maybe_stringify(None::<!>));
+}
+