[issue37712] Exception frames from unittest.TestCase.fail dependent on nesting

[Karthikeyan Singaravelan]

Change by Karthikeyan Singaravelan <tir.karthi at gmail.com>:


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nosy: +ezio.melotti, michael.foord, rbcollins

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37712>
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