There are widely used extensions and there are avoided extensions: http://stackoverflow.com/questions/801785/should-i-use-ghc-haskell-extensions-or-not http://

There are widely used extensions and there are avoided extensions: http://stackoverflow.com/questions/801785/should-i-use-ghc-haskell-extensions-or-not http://stackoverflow.com/questions/801785/should-i-use-ghc-h...