Re: [Haskell-cafe] Implementing `MonadBaseControl IO` for application type

Magnus Therning writes:

Li-yao Xia writes:

Adding `UndecidableInstances` is something I'm not quite comfortable with, since I don't understand what it means.

UndecideableInstances is not too bad, because the default heuristic in Haskell2010 is very conservative. https://downloads.haskell.org/~ghc/latest/docs/html/users_guide/glasgow_exts... -- Jack