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CallStack requires tuples, instances of which are defined in GHC.Tuple. Unfortunately the change made in D757 to the `Typeable` deriving mechanism means that `GHC.Tuple` must import `GHC.Types` for types necessary to generate type representations. This results in a cycle. Test Plan: Validate Reviewers: gridaphobe, austin, hvr Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D1298
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