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

This package is not currently in any snapshots. If you're interested in using it, we recommend adding it to Stackage Nightly. Doing so will make builds more reliable, and allow stackage.org to host generated Haddocks.

BSD-3-Clause licensed by Andy Gill, Ross Paterson, Daniel Mendler

NOTE: From version on the modules provided by this package went upstream to transformers. This package acts as a compatibility package for GHC versions older than 8.6. 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).