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So this is not quite what we discussed on Discord, but I hope you'll like it better since you are suspicious of the two-parameter typeclasses. This does away with that by keeping the effect used for tracing completely opaque. This enables instances for bothKleisli
andIOLocal
.IMO the ugliest part of it is that users will have to wrap their program in:Everything subject to bikeshed of course. Let me know what you think!