Add regression test for Issue 26997.

rust-lang#26997

src/test/run-pass/issue-26997.rs

@@ -0,0 +1,22 @@
+// 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.
+
+pub struct Foo {
+    x: isize,
+    y: isize
+}
+
+impl Foo {
+    pub extern fn foo_new() -> Foo {
+        Foo { x: 21, y: 33 }
+    }
+}
+
+fn main() {}