auto merge of #18755 : japaric/rust/ord, r=alexcrichton

Closes #18738
cc #15689

r? @alexcrichton 
cc @cmr

src/test/run-pass/issue-18738.rs

@@ -0,0 +1,25 @@
+// Copyright 2014 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.
+
+#[deriving(PartialEq, PartialOrd)]
+enum Test<'a> {
+    Int(&'a int),
+    Slice(&'a [u8]),
+}
+
+#[deriving(PartialEq, PartialOrd)]
+struct Version {
+    vendor_info: &'static str
+}
+
+#[deriving(PartialEq, PartialOrd)]
+struct Foo(&'static str);
+
+fn main() {}