code: def test_custom_root_errors(self):
      with self.assertRaisesRegex(
          TypeError, re.escape("f() output pytree")
      ):
          lax.custom_root(
              lambda x: (x, x), 0.0, lambda f, x: x, lambda f, x: x
          )
      with self.assertRaisesRegex(
          TypeError, re.escape("solve() output pytree")
      ):
          lax.custom_root(
              lambda x: x, 0.0, lambda f, x: (x, x), lambda f, x: x
          )
  
      def dummy_root_usage(x):
          f = lambda y: x - y
          return lax.custom_root(
              f, 0.0, lambda f, x: x, lambda f, x: (x, x)
          )
  
      with self.assertRaisesRegex(
          TypeError, re.escape("tangent_solve() output pytree")
      ):
          jax.jvp(dummy_root_usage, (0.0,), (0.0,))
  
imports: import re
  from absl.testing import absltest
  from absl.testing import parameterized
  import numpy
  import jax
  from jax import lax
  from jax._src import test_util
  from jax import tree_util
  import jax.numpy
  import jax.scipy
  from jax import config
label_desc: Use image node_id 6 for calling the CustomRootTest obj's underlying member method code with example usage: obj.test_custom_root_errors() and returns: lax