--- /dev/null
+// Copyright 2013 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.
+
+// Ensures that it's legal to create a recursive stack closure as long as
+// its environment is copyable
+
+struct R<'self> {
+ // This struct is needed to create the
+ // otherwise infinite type of a fn that
+ // accepts itself as argument:
+ c: &'self fn:Copy(&R, uint) -> uint
+}
+
+fn main() {
+ // Stupid version of fibonacci.
+ let fib: &fn:Copy(&R, uint) -> uint = |fib, x| {
+ if x == 0 || x == 1 {
+ x
+ } else {
+ (fib.c)(fib, x-1) + (fib.c)(fib, x-2)
+ }
+ };
+ assert!(fib(&R { c: fib }, 7) == 13);
+}