bson: Add test for embedded unexported struct using the ",inline" flag.

This test is currently breaking with Go 1.6 due to changes in the `reflect` package.

bson/bson_test.go

@@ -1053,6 +1053,13 @@ type inlineDupMap struct {
 type inlineBadKeyMap struct {
 	M map[int]int ",inline"
 }
+type inlineUnexported struct {
+	M          map[string]interface{} ",inline"
+	unexported         ",inline"
+}
+type unexported struct {
+	A int
+}
 
 type getterSetterD bson.D
 
@@ -1284,6 +1291,7 @@ var twoWayCrossItems = []crossTypeItem{
 	{&inlineMapInt{A: 1, M: map[string]int{"b": 2}}, map[string]int{"a": 1, "b": 2}},
 	{&inlineMapInt{A: 1, M: nil}, map[string]int{"a": 1}},
 	{&inlineMapMyM{A: 1, M: MyM{"b": MyM{"c": 3}}}, map[string]interface{}{"a": 1, "b": map[string]interface{}{"c": 3}}},
+	{&inlineUnexported{M: map[string]interface{}{"b": 1}, unexported: unexported{A: 2}}, map[string]interface{}{"b": 1, "a": 2}},
 
 	// []byte <=> Binary
 	{&struct{ B []byte }{[]byte("abc")}, map[string]bson.Binary{"b": bson.Binary{Data: []byte("abc")}}},