They say their codebase includes 400k lines of Haskell code (plus 4.5M lines of Mu). Also, they use GHC which is a huge Haskell program, and they customize it with their own extensions etc.
As they copy Haskell library code and only sometimes modify it, I would count it as Haskell code until they modify it.
As they copy Haskell library code and only sometimes modify it, I would count it as Haskell code until they modify it.