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Ryan Scott authored
Summary: This reverts commit a0899b2f. This is because removing these checks prompts panics in at least two different programs reported in #12785. Test Plan: ./validate Reviewers: simonpj, goldfire, bgamari, austin Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D2931 GHC Trac Issues: #12785
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