[issue43981] test_idle is leaking references

[Terry J. Reedy]

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

I was just about to try adding that exact cleanup close after finishing reading emails ;-).  Sorry I didn't think of it last night.  Glad it worked.  The alternative would have been to skip the test case.

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<https://bugs.python.org/issue43981>
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