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This should result in zero. Failing to realize this caused us to try to constant-fold via the normal path, resulting in #14272. Test Plan: Validate with coming tests Reviewers: austin, simonpj Subscribers: simonpj, rwbarton, thomie, hvr GHC Trac Issues: #14272 Differential Revision: https://phabricator.haskell.org/D4025
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