diff --git a/src/calltree.js b/src/calltree.js
index d1c1a57..5b4a6a2 100644
--- a/src/calltree.js
+++ b/src/calltree.js
@@ -1,3 +1,4 @@
+import {update_children} from './parse_js.js'
 import {map_accum, map_find, map_object, stringify, findLast} from './utils.js'
 import {is_eq, find_error_origin_node} from './ast_utils.js'
 import {find_node, find_leaf, ancestry_inc} from './ast_utils.js'
@@ -147,7 +148,7 @@ export const add_frame = (
   let frame
   frame = state.frames?.[active_calltree_node.id]
   if(frame == null) {
-    frame = eval_frame(active_calltree_node, state.modules)
+    frame = update_children(eval_frame(active_calltree_node, state.modules))
     const execution_paths = active_calltree_node.toplevel
       ? null
       : get_execution_paths(frame)
diff --git a/src/eval.js b/src/eval.js
index 2cb624e..9e8792b 100644
--- a/src/eval.js
+++ b/src/eval.js
@@ -1029,9 +1029,12 @@ const eval_decl_pair = (s, eval_cxt, frame_cxt) => {
         }
       })
     ),
-    n => n.result == null
-      ? {...n, result: {ok}}
-      : n
+    n => 
+      // TODO this should set result for default values in destructuring
+      // Currently not implemented
+      n.result == null
+        ? {...n, result: {ok}}
+        : n
   )
 
   const s_evaled = {...s_expr_evaled, children: [
diff --git a/src/parse_js.js b/src/parse_js.js
index 4af05ce..a9e5345 100644
--- a/src/parse_js.js
+++ b/src/parse_js.js
@@ -1561,7 +1561,7 @@ const update_children_not_rec = (node, children = node.children) => {
   }
 }
 
-const update_children = node => {
+export const update_children = node => {
   if(Array.isArray(node)) {
     return node.map(update_children)
   } else {
diff --git a/test/test.js b/test/test.js
index d855aa4..2a31b57 100644
--- a/test/test.js
+++ b/test/test.js
@@ -873,9 +873,15 @@ export const tests = [
     const frame = active_frame(i)
     assert_equal(
       // value for z in return statement
-      frame.children[1].children[0].children[0].result.value, 
+      find_node(frame.children[1], n => n.value == 'z').result.value,
       1
     )
+    // TODO not implemented
+    //assert_equal(
+    //  // value for x in arguments
+    //  find_node(frame.children[0], n => n.value == 'x').result.value,
+    //  1
+    //)
   }),
 
   test('array spread not iterable', () => {
@@ -2653,6 +2659,12 @@ const y = x()`
     })
   }),
 
+  test('move_cursor destructuring default', () => {
+    const code = `const [x = 1, y] = [undefined, 2]`
+    const s = test_initial_state(code)
+    assert_equal(s.value_explorer.result.value, {x: 1, y: 2})
+  }),
+
   test('move_cursor after type toplevel', () => {
     const code = `1`
     const s1 = test_initial_state(code)