Control.Monad.Error.Lens

[tonymorris]

The Control.Monad.Error.Lens module should be in module Papa.

[tonymorris]

@puffnfresh Do you use this module?

[puffnfresh]

@tonymorris no, I don't but it conflicts with Control.Exception.Lens which seems pretty useful though I've only used it a tiny amount.

[tonymorris]

OK yeah, maybe that is the right module to export.

[tonymorris]

Control.Exception.Lens seems more geared toward Exception e => rather than MonadError e m =>.

I prefer MonadError since it corresponds to exactly MonadEither if it were to exist (despite the word error in the name). I think Exception is busted.

[puffnfresh]

I think Control.Exception.Lens is useful but probably for legacy reasons. I agree it doesn't make much sense in a replacement Prelude.