old_contents: from symengine import symbols, sin, sinh, Lambdify, have_numpy, have_llvm
  import pickle
  import unittest
  
  @unittest.skipUnless(have_llvm, "No LLVM support")
  @unittest.skipUnless(have_numpy, "Numpy not installed")
  def test_llvm_double():
      import numpy as np
      args = x, y, z = symbols('x y z')
      expr = sin(sinh(x+y) + z)
      l = Lambdify(args, expr, cse=True, backend='llvm')
      ss = pickle.dumps(l)
      ll = pickle.loads(ss)
      inp = [1, 2, 3]
      assert np.allclose(l(inp), ll(inp))
  
  
new_contents: from symengine import symbols, sin, sinh, have_numpy, have_llvm
  import pickle
  import unittest
  
  @unittest.skipUnless(have_llvm, "No LLVM support")
  @unittest.skipUnless(have_numpy, "Numpy not installed")
  def test_llvm_double():
      import numpy as np
      from symengine import Lambdify
      args = x, y, z = symbols('x y z')
      expr = sin(sinh(x+y) + z)
      l = Lambdify(args, expr, cse=True, backend='llvm')
      ss = pickle.dumps(l)
      ll = pickle.loads(ss)
      inp = [1, 2, 3]
      assert np.allclose(l(inp), ll(inp))
  
  
subject: Fix import error