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If `-haddock` is set, we now extract docstrings from the renamed ast and serialize them in the .hi-files. This includes some of the changes from D4749 with the notable exceptions of the docstring lexing and renaming. A currently limited and experimental GHCi :doc command can be used to display docstrings for declarations. The formatting of pretty-printed docstrings is changed slightly, causing some changes in testsuite/tests/haddock. Test Plan: ./validate Reviewers: alexbiehl, hvr, gershomb, harpocrates, bgamari Reviewed By: alexbiehl Subscribers: rwbarton, thomie, carter Differential Revision: https://phabricator.haskell.org/D4758
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