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David Feuer authored
Explain why we don't have a rule to optimize `dataToTag# (tagToEnum# x)` to `x`. [skip ci] Reviewers: bgamari Reviewed By: bgamari Subscribers: rwbarton, thomie, carter GHC Trac Issues: #14282 Differential Revision: https://phabricator.haskell.org/D4375
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