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Ryan Scott authored
`(:~~:)`, the hetergeneous version of `(:~:)`, should have class instances similar to those of `(:~:)`, especially since their implementations aren't particularly tricky or surprising. This adds them. Reviewers: bgamari, austin, hvr, goldfire Reviewed By: bgamari Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D3181
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