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break cycle in chained exceptions #1540

merged 1 commit into from May 12, 2019

break cycle in chained exceptions #1540

merged 1 commit into from May 12, 2019


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closes #1536

The traceback formatter followed exc_value.__context__ infinitely, even if there was a cycle. Add a memo set to track what's been seen already and break when it detects a cycle.

@davidism davidism added this to the 0.15.3 milestone May 12, 2019
@davidism davidism merged commit bdc17e4 into 0.15.x May 12, 2019
@davidism davidism deleted the break-tb-cycle branch May 12, 2019 14:55
while True:
self.groups.append(Group(exc_type, exc_value, tb))
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this assumes hashability of exceptions (which isn't always true), I wrote a fix for this: #1542

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