From 2ea79e0340c01d58ebeeaab9d31ffdd64250a24b Mon Sep 17 00:00:00 2001
From: Behdad Esfahbod <behdad@behdad.org>
Date: Wed, 26 Dec 2018 19:01:46 -0500
Subject: [PATCH] [iter] Minor

---
 src/test-iter.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/test-iter.cc b/src/test-iter.cc
index 2baf7d7a0..89ca79937 100644
--- a/src/test-iter.cc
+++ b/src/test-iter.cc
@@ -78,7 +78,7 @@ test_iterator (Iterator it)
 }
 
 template <typename Iterable> static void
-test_iterable (Iterable &lst)
+test_iterable (Iterable &lst = Null(Iterable))
 {
   // Test that can take iterator from.
   test_iterator (lst.iter ());