NameError: name 'MAKE_CLOSURE' is not defined

При попытке использовать byteplay3 на питоне 3.8:

>>> import byteplay3
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/byteplay3.py", line 400, in <module>
    hascode = set( [ Opcode(MAKE_FUNCTION), Opcode(MAKE_CLOSURE) ] )
NameError: name 'MAKE_CLOSURE' is not defined

как исправить?