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Ryan Scott authored
This adds new constructors `UnboxedSumE`, `UnboxedSumT`, and `UnboxedSumP` to represent unboxed sums in Template Haskell. One thing you can't currently do is, e.g., `reify ''(#||#)`, since I don't believe unboxed sum type/data constructors can be written in prefix form. I will look at fixing that as part of #12514. Fixes #12478. Test Plan: make test TEST=T12478_{1,2,3} Reviewers: osa1, goldfire, austin, bgamari Reviewed By: goldfire, bgamari Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D2448 GHC Trac Issues: #12478
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