code: def test_listdtype_hash():
      a = cudf.core.dtypes.ListDtype("int64")
      b = cudf.core.dtypes.ListDtype("int64")
  
      assert hash(a) == hash(b)
  
      c = cudf.core.dtypes.ListDtype("int32")
  
      assert hash(a) != hash(c)
  
imports: import functools
  import operator
  import numpy
  import pandas
  import pyarrow
  import pytest
  import cudf
  from cudf import NA
  from cudf._lib.copying import get_element
  from cudf.api.types import is_scalar
  from cudf.testing._utils import DATETIME_TYPES, NUMERIC_TYPES, TIMEDELTA_TYPES, assert_eq
label_desc: Use image node_id 5 for calling a global function with example usage: test_listdtype_hash() without return types