[issue40696] exception chain cycles cause hangs (was "Exception handling with "await" can hang in Python3.9.0b1")

[Dennis Sweeney]

Dennis Sweeney <sweeney.dennis650 at gmail.com> added the comment:

Wouldn't Floyd's or Brent's cycle detection algorithms be better here than the allocation of a new set? I believe they might also eliminate the need to fast-path the first 100 or however many.

As in: https://en.wikipedia.org/wiki/Cycle_detection

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nosy: +Dennis Sweeney

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<https://bugs.python.org/issue40696>
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