code: def testAnnotations(self):
      # This test is mainly meant for static type checking: we want to ensure that
      # Tracer and ArrayImpl are valid as array.Array.
      def f(x: Any) -> typing.Array | None:
          if isinstance(x, core.Tracer):
              return x
          elif isinstance(x, ArrayImpl):
              return x
          else:
              return None
  
      x = jnp.arange(10)
      y = f(x)
      self.assertArraysEqual(x, y)
  
imports: from __future__ import annotations
  from typing import Any, TYPE_CHECKING
  import jax
  from jax._src import core
  from jax._src import test_util
  from jax._src import typing
  from jax import lax
  import jax.numpy
  from jax._src.array import ArrayImpl
  from absl.testing import absltest
  import numpy
label_desc: Use image node_id 4 for calling the TypingTest obj's underlying member method code with example usage: obj.testAnnotations() and returns: x, x, None