Add tests for ! type

src/test/run-pass/never-result.rs

@@ -0,0 +1,25 @@
+// 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.
+
+#![feature(never_type)]
+
+fn main() {
+    let x: Result<u32, !> = Ok(123);
+    match x {
+        Ok(z) => (),
+        Err(y) => {
+            let q: u32 = y;
+            let w: i32 = y;
+            let e: String = y;
+            y
+        },
+    }
+}
+

src/test/run-pass/unit-fallback.rs

@@ -0,0 +1,35 @@
+// 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.
+
+trait Balls: Sized {
+    fn smeg() -> Result<Self, ()>;
+}
+
+impl Balls for () {
+    fn smeg() -> Result<(), ()> { Ok(()) }
+}
+
+struct Flah;
+
+impl Flah {
+    fn flah<T: Balls>(&self) -> Result<T, ()> {
+        T::smeg()
+    }
+}
+
+fn doit() -> Result<(), ()> {
+    let _ = try!(Flah.flah());
+    Ok(())
+}
+
+fn main() {
+    let _ = doit();
+}
+