auto merge of #7177 : huonw/rust/unfold-fix, r=thestinger

Author: bors

src/libstd/iterator.rs

@@ -816,8 +816,8 @@ impl<'self, A, St> UnfoldrIterator<'self, A, St> {
     /// Creates a new iterator with the specified closure as the "iterator
     /// function" and an initial state to eventually pass to the iterator
     #[inline]
-    pub fn new(f: &'self fn(&mut St) -> Option<A>, initial_state: St)
-        -> UnfoldrIterator<'self, A, St> {
+    pub fn new<'a>(f: &'a fn(&mut St) -> Option<A>, initial_state: St)
+        -> UnfoldrIterator<'a, A, St> {
         UnfoldrIterator {
             f: f,
             state: initial_state

src/test/run-pass/unfoldr-cross-crate.rs

@@ -0,0 +1,34 @@
+// 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.
+
+use std::iterator::*;
+
+// UnfoldrIterator had a bug with 'self that mean it didn't work
+// cross-crate
+
+fn main() {
+    fn count(st: &mut uint) -> Option<uint> {
+        if *st < 10 {
+            let ret = Some(*st);
+            *st += 1;
+            ret
+        } else {
+            None
+        }
+    }
+
+    let mut it = UnfoldrIterator::new(count, 0);
+    let mut i = 0;
+    for it.advance |counted| {
+        assert_eq!(counted, i);
+        i += 1;
+    }
+    assert_eq!(i, 10);
+}