'If' object has no attribute 'body_vars'
Line https://github.com/folkertvanheusden/monkeycoder/blob/master/processor_z80.py#L83 

    width = random.choice([8, 16]) if sub_type in [processor.Instruction.i_add, processor.Instruction.i_add_carry, processor.Instruction.i_sub_carry] else 8

triggers the following error in py2many --cpp=1:

    processor_z80.py:83:0: py2many.exceptions.AstNotImplementedError: 'If' object has no attribute 'body_vars'

