code: def test_deepcopy_on_nested_readonly_dict_can_be_mutated():
      d = dict(a=1, b=dict(c=3))
      d = make_read_only(d)
      copied_d = deepcopy(d)
      copied_d["b"]["c"] = 4
      assert d["b"]["c"] != copied_d["b"]["c"]
  
imports: import json
  import pickle
  import pytest
  from copy import copy, deepcopy
  from sacred.config.custom_containers import make_read_only, ReadOnlyList, ReadOnlyDict
  from sacred.utils import SacredError
label_desc: Use image node_id 15 for calling a global function with example usage: test_deepcopy_on_nested_readonly_dict_can_be_mutated() without return types