diff --git a/src/ccmeta.leg b/src/ccmeta.leg
index 5c8bada..34ab3d1 100644
--- a/src/ccmeta.leg
+++ b/src/ccmeta.leg
@@ -3,7 +3,7 @@
 # Copyright (c) 2016-2021 Ian Piumarta and other contributors (see AUTHORS)
 # All rights reserved (see LICENSE)
 #
-# Last edited: 2023-03-22 16:55:04 by piumarta on zora-10.local
+# Last edited: 2023-03-22 17:00:49 by piumarta on zora-10.local
 
 %{
 /* compile:	leg -o ccmeta.c ccmeta.leg
@@ -1294,6 +1294,55 @@ typedef enum  {
 
 language lang = C, printLang = C;
 
+oop clone(oop obj)
+{
+    switch(getType(obj)) {
+        case Undefined:
+        case Integer:
+        case Float:
+        case Function:
+        case Symbol:
+            return obj;
+        case String:
+            return makeString(get(obj, String, value));
+        case Map: {
+            struct Pair *elements= malloc(sizeof(struct Pair) * get(obj, Map, capacity));
+            memcpy(elements, get(obj, Map, elements), sizeof(struct Pair) * get(obj, Map, capacity));
+            oop map= malloc(sizeof(*obj));
+            memcpy(map, obj, sizeof(*obj));
+            set(map, Map, elements, elements);
+            return map;
+        }
+    }
+    return obj;
+}
+
+oop treeCopy(oop obj)
+{
+    switch(getType(obj)) {
+        case Undefined:
+        case Integer:
+        case Float:
+        case Function:
+        case Symbol:
+            return obj;
+        case String:
+            return makeString(get(obj, String, value));
+        case Map: {
+            struct Pair *elements= malloc(sizeof(struct Pair) * get(obj, Map, size));
+            memcpy(elements, get(obj, Map, elements), sizeof(struct Pair) * get(obj, Map, size));
+            oop map= malloc(sizeof(*obj));
+            memcpy(map, obj, sizeof(*obj));
+            for (int i = 0; i<get(obj, Map, size); i++) {
+              elements[i].value = treeCopy(elements[i].value); 
+            }
+            set(map, Map, elements, elements);
+            return map;
+        }
+    }
+    return obj;
+}
+
 %}
 
 
@@ -2517,29 +2566,6 @@ oop map_zip(oop map, oop keys, oop values)
     return map;
 }
 
-oop clone(oop obj)
-{
-    switch(getType(obj)) {
-        case Undefined:
-        case Integer:
-        case Float:
-        case Function:
-        case Symbol:
-            return obj;
-        case String:
-            return makeString(get(obj, String, value));
-        case Map: {
-            struct Pair *elements= malloc(sizeof(struct Pair) * get(obj, Map, capacity));
-            memcpy(elements, get(obj, Map, elements), sizeof(struct Pair) * get(obj, Map, capacity));
-            oop map= malloc(sizeof(*obj));
-            memcpy(map, obj, sizeof(*obj));
-            set(map, Map, elements, elements);
-            return map;
-        }
-    }
-    return obj;
-}
-
 struct Call
 {
     oop ast, function;
@@ -3472,6 +3498,12 @@ oop prim_clone(oop scope, oop params)
     return null;
 }
 
+oop prim_treeCopy(oop scope, oop params)
+{
+    if (map_hasIntegerKey(params, 0)) return treeCopy(get(params, Map, elements)[0].value);
+    return null;
+}
+
 oop prim_print(oop scope, oop params)
 {
     assert(is(Map, params));
@@ -4608,6 +4640,7 @@ void init(void)
     map_set(globals, intern("invoke"      ), makeFunction(prim_invoke,       intern("invoke"      ), null, null, globals, null));
     map_set(globals, intern("apply"       ), makeFunction(prim_apply,        intern("apply"       ), null, null, globals, null));
     map_set(globals, intern("clone"       ), makeFunction(prim_clone,        intern("clone"       ), null, null, globals, null));
+    map_set(globals, intern("treeCopy"    ), makeFunction(prim_treeCopy,     intern("treeCopy"    ), null, null, globals, null));
     map_set(globals, intern("import"      ), makeFunction(prim_import,       intern("import"      ), null, null, globals, null));
     map_set(globals, intern("microseconds"), makeFunction(prim_microseconds, intern("microseconds"), null, null, globals, null));
     map_set(globals, intern("string"      ), makeFunction(prim_String      , intern("string"      ), null, null, globals, null));