WriteT and RWST monad transformers https://github.com/minad/writer-cps-transformers#readme

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BSD-3-Clause licensed by Andy Gill, Ross Paterson, Daniel Mendler
Maintained by [email protected]

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The WriterT and RWST monad transformers provided by writer-cps-transformers are written in continuation passing style and avoid the space-leak problem of the traditional Control.Monad.Trans.Writer.Strict and Control.Monad.Trans.Writer.Lazy. The corresponding MTL class instances are in the package writer-cps-mtl (http://hackage.haskell.org/package/writer-cps-mtl).