Frankly after you've filtered out all that, I'd be astonished if you have anything left. It seems to be usual practice on Hackage to switch on a swag of LANGUAGE pragmas even if this module isn't using them. (MPTCs, FlexibleInstances/Contexts in particular.)

A depressing remark, which comes close to saying there is no true Haskell. It's one reason I hang mostly with Hugs. GHC pretty well repudiates Haskell 2010. May Haskell 2020 receive more respect! Doug