Reset reference to failed test frame before each test executes #3384
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Otherwise we will keep the last failed exception around forever Related to pytest-dev#2798
RonnyPfannschmidt
approved these changes
Apr 11, 2018
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Fixes #2798. Not entirely because I was not able to remove the cyclic references which seem to be caused by the traceback objects being kept around; those cycles will be eventually be claimed by the garbage collector, at least (with the previous code that was not even possible).