From 52d0b8779a421a90fb3aaffe9ca24b1fadfdf4e4 Mon Sep 17 00:00:00 2001
From: Andrew Dunham <andrew@du.nham.ca>
Date: Wed, 15 Apr 2015 11:17:33 -0700
Subject: [PATCH] Add an additional static type assertion

---
 graph/iterator/optional_iterator.go | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/graph/iterator/optional_iterator.go b/graph/iterator/optional_iterator.go
index c8c7fec..84e7154 100644
--- a/graph/iterator/optional_iterator.go
+++ b/graph/iterator/optional_iterator.go
@@ -156,3 +156,5 @@ func (it *Optional) Stats() graph.IteratorStats {
 func (it *Optional) Size() (int64, bool) {
 	return 0, true
 }
+
+var _ graph.Iterator = &Optional{}