olafklinke

`MonadAccum` exists only in `mtl >= 2.3` and the current lower bound is 2.2.2 so the bound in the dependency must be increased to be able to implement the instance.

MonadWriter can be done, but it is not so straightforward because of listen and pass. I have an implementation and file a PR asap. Olaf ________________________________ Von: Lev Dvorkin ***@***.***>...

The [PR](https://github.com/mrkkrp/megaparsec/pull/534) is able to merge.