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I am aware that the docstring, shown at help(compile), is what you were talking about. The docstring and manuals should say the same thing, or at least not contradict each other, so it is common for both to be out of date and both to be updated at the same time. So I went and looked at the current py2 and py3 docs to see if they also need change. And they do, though not quite as much. src and dst were unofficial abbreviations for source and output, in reference to what you said. Sorry for the confusion.