testsuite: Add xfailed test for #4335

Author: catamorphism

src/test/compile-fail/issue-4335.rs

@@ -0,0 +1,19 @@
+// Copyright 2012 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.
+
+// xfail-test
+fn id<T>(t: T) -> T { t }
+
+fn f<T>(v: &r/T) -> &r/fn()->T { id::<&r/fn()->T>(|| *v) } //~ ERROR ???
+
+fn main() {
+    let v = &5;
+    io::println(fmt!("%d", f(v)()));
+}