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Glasgow Haskell Compiler / GHC
5565 commits behind the upstream repository.

Vladislav Zavialov
authored
Summary of changes
* Remove Language.Haskell.Syntax.Concrete
* Move all tokens into GhcPs extension fields (LHsToken -> EpToken)
* Create new TTG extension fields as needed
* Drop the MultAnn wrapper
Updates the haddock submodule.
Co-authored-by:
Alan Zimmerman <alan.zimm@gmail.com>