code: def test_function_body_uses_nested_listcomps(self):
      @st.cache()
      def foo(arg):
          production = [
              [outer + inner for inner in range(3)]
              for outer in range(3)
          ]
          return production
  
      # make sure st.cache() doesn't crash, per https://github.com/streamlit/streamlit/issues/2305
      self.assertEqual(foo(1), [[0, 1, 2], [1, 2, 3], [2, 3, 4]])
  
imports: import threading
  import types
  from unittest.mock import Mock, patch
  from parameterized import parameterized
  import streamlit
  from streamlit.elements import exception
  from streamlit.proto.Exception_pb2 import Exception
  from streamlit.runtime.legacy_caching import caching, hashing
  from tests import testutil
  from tests.delta_generator_test_case import DeltaGeneratorTestCase
label_desc: Use image node_id 15 for calling the CacheTest obj's underlying member method code with example usage: obj.test_function_body_uses_nested_listcomps() and returns: production