@@ -88,19 +88,19 @@ private ConcreteFunction maybe_uncache_variable_captures(ConcreteFunction concre
 
     public override (IList<Trackable>, IDictionary<Trackable, IEnumerable<TrackableReference>>) breadth_first_traversal()
     {
-        Trackable get_merged_trackable(Trackable x)
+        void merged_trackable(Trackable x)
         {
             // TODO: complete it with new definitions `Asset` and `TrackableConstant`.
-            return x;
         }
+
         var trackable_objects = base.breadth_first_traversal();
 
         foreach(var obj in _children_cache.Keys)
         {
             // skip the deletion of cache (maybe do it later).
             foreach(var pair in _children_cache[obj])
             {
-                _children_cache[obj][pair.Key] = get_merged_trackable(pair.Value);
+                merged_trackable(pair.Value);
             }
         }
 
@@ -109,15 +109,11 @@ Trackable get_merged_trackable(Trackable x)
 
     public List<(string, Trackable)> list_dependencies(Trackable obj)
     {
-        IDictionary<string, Trackable> children;
-        if (!_children_cache.ContainsKey(obj))
+        if (!_children_cache.TryGetValue(obj, out var children))
         {
             children= new Dictionary<string, Trackable>();
         }
-        else
-        {
-            children= _children_cache[obj];
-        }
+
         List<(string, Trackable)> res = new();
         foreach(var pair in obj.deserialization_dependencies(children))
         {
Original file line number	Diff line number	Diff line change
@@ -88,19 +88,19 @@ private ConcreteFunction maybe_uncache_variable_captures(ConcreteFunction concre
88	88
89	89	public override (IList<Trackable>, IDictionary<Trackable, IEnumerable<TrackableReference>>) breadth_first_traversal()
90	90	{
91		- Trackable get_merged_trackable(Trackable x)
	91	+ void merged_trackable(Trackable x)
92	92	{
93	93	// TODO: complete it with new definitions `Asset` and `TrackableConstant`.
94		- return x;
95	94	}
	95	+
96	96	var trackable_objects = base.breadth_first_traversal();
97	97
98	98	foreach(var obj in _children_cache.Keys)
99	99	{
100	100	// skip the deletion of cache (maybe do it later).
101	101	foreach(var pair in _children_cache[obj])
102	102	{
103		- _children_cache[obj][pair.Key] = get_merged_trackable(pair.Value);
	103	+ merged_trackable(pair.Value);
104	104	}
105	105	}
106	106
@@ -109,15 +109,11 @@ Trackable get_merged_trackable(Trackable x)
109	109
110	110	public List<(string, Trackable)> list_dependencies(Trackable obj)
111	111	{
112		- IDictionary<string, Trackable> children;
113		- if (!_children_cache.ContainsKey(obj))
	112	+ if (!_children_cache.TryGetValue(obj, out var children))
114	113	{
115	114	children= new Dictionary<string, Trackable>();
116	115	}
117		- else
118		- {
119		- children= _children_cache[obj];
120		- }
	116	+
121	117	List<(string, Trackable)> res = new();
122	118	foreach(var pair in obj.deserialization_dependencies(children))
123	119	{