From db364bc6efb474da6f3aecefa446d27516324ac3 Mon Sep 17 00:00:00 2001
From: pocke <p.ck.t22@gmail.com>
Date: Mon, 12 Jan 2015 15:13:13 +0900
Subject: [PATCH] check type

---
 errors.go | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/errors.go b/errors.go
index e682d78..83d7e92 100644
--- a/errors.go
+++ b/errors.go
@@ -19,3 +19,5 @@ func (e *EventNotDefined) Error() string {
 func (e *EventNotDefined) EventName() string {
 	return e.eventName
 }
+
+var _ error = newEventNotDefined("foo")