code: def test_union_noncomparable(self, sort):
      # corner case, Index with non-int64 dtype
      index = RangeIndex(start=0, stop=20, step=2)
      other = Index(
          [datetime.now() + timedelta(i) for i in range(4)],
          dtype=object,
      )
      result = index.union(other, sort=sort)
      expected = Index(np.concatenate((index, other)))
      tm.assert_index_equal(result, expected)
  
      result = other.union(index, sort=sort)
      expected = Index(np.concatenate((other, index)))
      tm.assert_index_equal(result, expected)
  
imports: from datetime import datetime, timedelta
  from hypothesis import assume, given, strategies
  import numpy
  import pytest
  from pandas import Index, RangeIndex
  import pandas._testing
label_desc: Use image node_id 5 for calling the TestRangeIndexSetOps obj's underlying member method code with example usage: obj.test_union_noncomparable(sort) without return types