Add regression tests from initial implementation review

Author: aturon

src/test/run-pass/specialization-out-of-order.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.
+
+// Test that you can list the more specific impl before the more general one.
+
+#![feature(specialization)]
+
+trait Foo {
+    type Out;
+}
+
+impl Foo for bool {
+    type Out = ();
+}
+
+impl<T> Foo for T {
+    default type Out = bool;
+}
+
+fn main() {}

src/test/run-pass/specialization-projection-alias.rs

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+// 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.
+
+#![feature(specialization)]
+
+// Regression test for ICE when combining specialized associated types and type
+// aliases
+
+trait Id_ {
+    type Out;
+}
+
+type Id<T> = <T as Id_>::Out;
+
+impl<T> Id_ for T {
+    default type Out = T;
+}
+
+fn main() {
+    let x: Id<bool> = panic!();
+}