code: def test_multi_modify(self):
      d = {"a": 1, "b": (2, 3), "c": [4, 5]}
      c = cursor(d)
      # test multiple changes on same element
      c["b"][0] = 6
      c["b"][0] = 7
      d2 = c.build()
      self.assertEqual(d2, {"a": 1, "b": (7, 3), "c": [4, 5]})
      # test nested changes
      c["a"] = (100, 200)
      c["a"][1] = -1
      d3 = c.build()
      self.assertEqual(d3, {"a": (100, -1), "b": (7, 3), "c": [4, 5]})
  
imports: import dataclasses
  from typing import Any, NamedTuple
  import jax
  import jax.numpy
  import optax
  from absl.testing import absltest
  import flax
  import flax.linen
  from flax.core import freeze
  from flax.cursor import AccessType, _traverse_tree, cursor
  from flax.errors import CursorFindError, TraverseTreeError
  from flax.training import train_state
label_desc: Use image node_id 8 for calling the CursorTest obj's underlying member method code with example usage: obj.test_multi_modify() without return types