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Re:Writing a Lisp: Explicit Stack and Stacktraces by reinvdwoerd on Friday May 12, 2017 @03:56PM (#14327367)
From the documentation:

"Maps an old state to a new state inside a state monad. The old state is thrown away."

https://hackage.haskell.org/package/mtl-2.2.1/docs/Control-M...

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