Hi all, I would like to reuse some streaming functions from the turtle package in the context of the servant streaming handler. Relevant references: https://hackage.haskell.org/package/turtle-1.6.1/docs/Turtle-Shell.html https://hackage.haskell.org/package/turtle-1.6.1/docs/Turtle-Prelude.html https://hackage.haskell.org/package/servant-0.20/docs/Servant-Types-SourceT.... As a simple example: Turtle.Prelude.ls function represents stream of FilePaths (directory listing of some path) ls :: FilePath -> Shell FilePath Servant streaming is based around SourceT IO a, for example: type ListFiles = "ls" :> StreamGet NewlineFraming PlainText (SourceT IO FilePath) The problem is that the streaming (Shell a) is not exactly the same as servant's (SourceT IO a). But as far as I understand, they both represent "stream of values of type 'a'". My question is: Is a generic conversion function possible? Something like: shellToSource :: forall a. Shell a -> SourceIO a shellToSource = ?? ... such that I could reuse the 'ls' and write a streaming servant handler like this: listFilesHandler :: Handler (SourceIO FilePath) listFilesHandler = pure $ shellToSource $ Turtle.Prelude.ls "somePath" Appreciate any suggestion. regards, Zoran