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

[Jack Kelly]

Magnus Therning <magnus at therning.org> writes:

> Li-yao Xia <lysxia at gmail.com> 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.html#extension-UndecidableInstances

-- Jack