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Summary: This adds TH support for the ImplicitParams and RecursiveDo extensions. I'm submitting this as one review because I cannot cleanly make the two commits independent. Initially, my goal was just to add ImplicitParams support, and I found that reasonably straightforward, so figured I might as well use my newfound knowledge to address some other TH omissions. Test Plan: Validate Reviewers: goldfire, austin, bgamari, RyanGlScott Reviewed By: RyanGlScott Subscribers: carter, RyanGlScott, thomie GHC Trac Issues: #1262 Differential Revision: https://phabricator.haskell.org/D1979
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