old_contents: import nose
  
  import simuvex
  import claripy
  
  def test_type_annotation():
      struct_ty = simuvex.s_type_backend.SimStructAbstract('mystruct')
      ptr = claripy.BVS('ptr', 32).annotate(simuvex.s_type_backend.TypeAnnotation(simuvex.s_type.SimTypePointer(struct_ty)))
      ptroffset = ptr + 4
  
      bt = simuvex.s_type_backend.TypeBackend()
      tv = bt.convert(ptroffset)
      nose.tools.assert_equal(tv.ty.pts_to.label, 'mystruct')
      nose.tools.assert_true(claripy.is_true(tv.ty.offset == 4))
  
  if __name__ == '__main__':
      test_type_annotation()
  
new_contents: import nose
  
  import simuvex
  import claripy
  
  def test_type_annotation():
      my_ty = simuvex.s_type.SimTypeTop()
      ptr = claripy.BVS('ptr', 32).annotate(simuvex.s_type_backend.TypeAnnotation(simuvex.s_type.SimTypePointer(my_ty, label=[])))
      ptroffset = ptr + 4
  
      bt = simuvex.s_type_backend.TypeBackend()
      tv = bt.convert(ptroffset)
      nose.tools.assert_is(tv.ty.pts_to, my_ty)
      nose.tools.assert_true(claripy.is_true(tv.ty.offset == 4))
  
  if __name__ == '__main__':
      test_type_annotation()
  
subject: update the test case