[issue33065] IDLE debugger: failure stepping through module loading

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

A StackOverflow use got the same _ModuleLock message.
https://stackoverflow.com/questions/54785596/debugger-in-python-freezes-over-own-built-modules

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<https://bugs.python.org/issue33065>
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