diff --git a/src/test/run-pass/sync-send-iterators-in-libcore.rs b/src/test/run-pass/sync-send-iterators-in-libcore.rs
new file mode 100644
index 00000000000..969cf853f05
--- /dev/null
+++ b/src/test/run-pass/sync-send-iterators-in-libcore.rs
@@ -0,0 +1,47 @@
+// Copyright 2015 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.
+
+// pretty-expanded FIXME #23616
+
+#![feature(collections)]
+
+fn is_sync<T>(_: T) where T: Sync {}
+fn is_send<T>(_: T) where T: Send {}
+
+macro_rules! all_sync_send {
+    ($ctor:expr, $($iter:ident),+) => ({
+        $(
+            let mut x = $ctor;
+            is_sync(x.$iter());
+            let mut y = $ctor;
+            is_send(y.$iter());
+        )+
+    })
+}
+
+fn main() {
+    // for char.rs
+    all_sync_send!("Я", escape_default, escape_unicode);
+
+    // for iter.rs
+    // FIXME
+
+    // for option.rs
+    // FIXME
+
+    // for result.rs
+    // FIXME
+
+    // for slice.rs
+    // FIXME
+
+    // for str/mod.rs
+    // FIXME
+}