+// 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 trait Tr<'a> {
+ type Out;
+}
+
+pub fn f<'a, T: Tr<'a>>() -> <T as Tr<'a>>::Out {}
+//~^ ERROR not all control paths return a value
+
+pub fn main() {}