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Simon Marlow authored
Summary: This code needs more comments, but I believe this is safe. By definition I can't have broken anything that was working by turning a panic into a non-panic anyway. Test Plan: validate Reviewers: hvr, simonpj, austin Subscribers: simonmar, relrod, ezyang, carter Differential Revision: https://phabricator.haskell.org/D105 GHC Trac Issues: #9329
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