code: def test_trainvar_and_ref_assign(self):
      m = objax.ModuleList([objax.TrainVar(jn.zeros(2))])
      m.append(objax.TrainRef(m[0]))
  
      def increase():
          m[0].assign(m[0].value + 1)
          m[1].assign(m[1].value + 1)
          return m[0].value
  
      jit_increase = objax.Jit(increase, m.vars())
      v = jit_increase()
      self.assertEqual(v.tolist(), [2.0, 2.0])
      self.assertEqual(m[0].value.tolist(), [2.0, 2.0])
  
file_path: objax/tests/jit.py
imports: import unittest
  import jax.numpy
  from jax.core import ConcretizationTypeError
  import objax
  from objax.typing import JaxArray
label_desc: Use image node_id 5 for calling the TestJit obj's underlying member method code with example usage: obj.test_trainvar_and_ref_assign() and returns: m