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Add support for -XGHC2021

Closed Joachim Breitner requested to merge wip/ghc2021 into master

This adds support for -XGHC2021, including setting it by default, and extending the user’s guide.

The main work here was updating the test suite. The test suite is affected in these ways:

  • Some tests rely on NondecreasingIndentation. Some I have changed to not need this, some I have added {-# LANGUAGE NondereasingIndentation #-}, some I have added {-# LANGUAGE Haskell2010 #-}
  • Some tests fail with (I think) PolyKinds. I have added {-# LANGUAGE Haskell2010 #-}
  • Some SafeHaskell related tests fail because GeneralizedNewtypeDeriving is on by default. I have added {-# LANGUAGE Haskell2010 #-}.
Edited by Joachim Breitner