After much tinkering I am announcing a new monads implementation:

https://github.com/bwo/monads

Rather than using protocols or symbol macros as (I believe) all hitherto
existing monad libraries for Clojure have, this implementation has the
elements of a monadic computation build up a structure which the individual
monads interpret, with the goal of allowing for flexibility and
expressiveness.

The wiki has a small benchmark, which also gives an example of using the
state monad:
https://github.com/bwo/monads/wiki/Tree-numbering-benchmark

And an example of using monad transformer stacks, demonstrating the state,
writer, maybe, and error monads:
https://github.com/bwo/monads/wiki/An-expression-evaluator

Feedback welcome!

-- 
Ben Wolfson
"Human kind has used its intelligence to vary the flavour of drinks, which
may be sweet, aromatic, fermented or spirit-based. ... Family and social
life also offer numerous other occasions to consume drinks for pleasure."
[Larousse, "Drink" entry]

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