From efea85cb9a06f1d4f661649f6beb5fd04597a366 Mon Sep 17 00:00:00 2001
From: Yasuhiro Matsumoto <mattn.jp@gmail.com>
Date: Tue, 10 Jan 2017 00:40:58 +0900
Subject: [PATCH] fixes #368

---
 _example/trace/main.go | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/_example/trace/main.go b/_example/trace/main.go
index 9f83ee1..269e452 100644
--- a/_example/trace/main.go
+++ b/_example/trace/main.go
@@ -1,3 +1,5 @@
+// +build trace
+
 package main
 
 import (