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Whenever a data instance is exported, the corresponding data family is exported, too. This allows one to write ``` -- Foo.hs module Foo where data family T a -- Bar.hs module Bar where import Foo data instance T Int = MkT -- Baz.hs module Baz where import Bar (T(MkT)) ``` In previous versions of GHC, this required a workaround explicit export list in `Bar`. Reviewers: bgamari, goldfire, austin Reviewed By: bgamari, goldfire Subscribers: goldfire, thomie Differential Revision: https://phabricator.haskell.org/D1573 GHC Trac Issues: #11164
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