add some tests

Author: Jorge Aparicio

src/test/compile-fail/pod-is-not-implicitly-copyable.rs

@@ -0,0 +1,20 @@
+// 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.
+
+use std::marker::Pod;
+
+fn drop<T>(_: T) {}
+
+fn double_move<T: Pod>(x: T) {
+    drop(x);
+    drop(x);  //~ ERROR use of moved value: `x`
+}
+
+fn main() {}

src/test/run-pass/derive-copy-on-pod-type.rs

@@ -0,0 +1,23 @@
+// 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.
+
+// This is not implicitly copyable
+#[derive(Pod)]
+struct Stuff {
+    x: u8,
+}
+
+// But this can be implicitly copyable
+#[derive(Copy)]
+struct Copyable {
+    pod: Stuff,
+}
+
+fn main() {}