Add regression for rust-lang#17068

Author: bkoropoff

src/test/run-pass/issue-17068.rs

@@ -0,0 +1,20 @@
+// 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.
+
+// Test that regionck creates the right region links in the pattern
+// binding of a for loop
+fn foo<'a>(v: &'a [uint]) -> &'a uint {
+    for &ref x in v.iter() { return x; }
+    unreachable!()
+}
+
+fn main() {
+    assert_eq!(foo(&[0]), &0);
+}