Eff

[Peteris Erins]

http://math.andrej.com/eff/

"Eff is a functional programming language based on algebraic effects
and their handlers." More details and resources at the URL.

Thoughts?

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Peteris Erins

[David Nolen]

I can't speak too much myself on the difficulties of dealing with monad transformers - but it's always nice to hear that PL folks take usability seriously :) 

Paper downloaded! Thanks.

David

[Brian Rice]

Atomo (a python/ruby-esque dynamic language embedded within Haskell) is an interpreter which uses Monad Transformers in the core, so reading through that might speak to the issue:  http://atomo-lang.org/ probably most relevant here  http://darcsden.com/alex/atomo/browse/src/Atomo/VMT.hs 

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-Brian T. Rice