move gob.Register(SceneRef) to sceneref.go

engine/asset.go

@@ -24,7 +24,6 @@ var (
 func init() {
 	gob.Register(AnimRef{})
 	gob.Register(ImageRef{})
-	gob.Register(SceneRef{})
 }
 
 type assetKey struct {

engine/sceneref.go

@@ -15,6 +15,10 @@ var (
 	_ Scener = &SceneRef{}
 )
 
+func init() {
+	gob.Register(SceneRef{})
+}
+
 // SceneRef loads a gzipped, gob-encoded Scene from the asset FS.
 // After Load, Scene is usable.
 // This is mostly useful for scenes that refer to other scenes, e.g.