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Ömer Sinan Ağacan authored
The assertion is triggered when we have a loop in the program (in which case we see the same update frame multiple times in the stack). See #14915 for more details. Reviewers: simonmar, bgamari, erikd Reviewed By: simonmar Subscribers: rwbarton, carter GHC Trac Issues: #14915 Differential Revision: https://phabricator.haskell.org/D5133
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