From 0bc0c03fece07c4f21ee5195743116a4d418f234 Mon Sep 17 00:00:00 2001
From: Mitchell Hashimoto <mitchell.hashimoto@gmail.com>
Date: Thu, 19 Feb 2015 11:26:02 -0800
Subject: [PATCH] helper/schema: zero value set should set function [GH-1009]

---
 helper/schema/field_reader.go | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/helper/schema/field_reader.go b/helper/schema/field_reader.go
index 2046581b7e..a2adb0ce6c 100644
--- a/helper/schema/field_reader.go
+++ b/helper/schema/field_reader.go
@@ -42,8 +42,8 @@ func (r *FieldReadResult) ValueOrZero(s *Schema) interface{} {
 
 	// The zero value of a set is nil, but we want it
 	// to actually be an empty set object...
-	if s.Type == TypeSet && result == nil {
-		result = &Set{F: s.Set}
+	if set, ok := result.(*Set); ok && set.F == nil {
+		set.F = s.Set
 	}
 
 	return result