code: def test_extended_oparg_not_ignored(self):
      # https://github.com/python/cpython/issues/91625
      target = "(" + "y," * 400 + ")"
      code = f"""def unpack_400(x):
              {target} = x
              return y
          """
      ns = {}
      exec(code, ns)
      unpack_400 = ns["unpack_400"]
      # Warm up the function for quickening (PEP 659)
      for _ in range(30):
          y = unpack_400(range(400))
          self.assertEqual(y, 399)
  
imports: import doctest
  import unittest
label_desc: Use image node_id 1 for calling the TestCornerCases obj's underlying member method code with example usage: obj.test_extended_oparg_not_ignored() without return types