MonadParse?

[kozross]

I've keenly felt the absence of an mtl-style type class of this sort in some current work.

[hdgarrood]

Just so you know, this library is more or less unmaintained. Aeson now provides errors which are more or less on par with this library’s; the only reason to use this one would be if you need structured error types rather than strings, or if you prefer the API.

[kozross]

Aww, that's a bit disappointing. I actually prefer structured error types massively, and the API is also much more pleasant.

[hdgarrood]

I also just remembered that this was proposed previously and I wasn’t keen on it then: #4