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Accept next docstrings (`-- | Docstring`) on GADT constructors. I have confirmed that this adds no shift/reduce conflicts. Test Plan: haddockA034 Reviewers: austin, simonpj, simonmar Reviewed By: simonmar Subscribers: Fuuzetsu, simonmar, thomie, mpickering, edsko Differential Revision: https://phabricator.haskell.org/D1086
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