I can confirm it fixes the bug, I'll add myself as a reviewer on Trac. If I understand correctly, originally, __copy__ function of element.pyx calls Expression.__new__(Expression) which should call an __init__ function (without argument ? but I don't know which ?) so _gobj is not initialized. When you try to call Expression() without argument you get an error because the only __init__ function defined in expression.pyx needs 1 argument (the symbolic ring used). Can someone clarify what is happening ?
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