Message 394165 - Python tracker
Anthony Sottile: "that version of flake8 uses multiprocessing (even for 1 file) -- would the ast objects be involved in that way? (pyflakes also makes reference cyles to handle "parent" relationships)" I expect flake8 to use the ast somewhere to analyze source code. But I don't have the bandwidth to investigate flake8 creates a reference cycle. The Python regression is fixed, I closed the issue. Thanks for the bug report Anthony!