Add a test for closed issue #9259

This must have been fixed in some recent trans refactor/rewrite, hurray!

Closes #9259

src/test/run-pass/issue-9259.rs

+// 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.
+
+struct A<'a> {
+    a: &'a [~str],
+    b: Option<&'a [~str]>,
+}
+
+pub fn main() {
+    let b = &[~"foo"];
+    let a = A {
+        a: &[~"test"],
+        b: Some(b),
+    };
+    assert_eq!(a.b.get_ref()[0].as_slice(), "foo");
+}