mtl-2.3.2

2.3.2 -- 2025-12-07

• Add Accum monad.
• Generalize MonadAccum instance for all Monad m underlying AccumT, not just Identity.
• Allow building monokinded ContT if the compiler is MicroHs.
• Fix an issue where QuantifiedConstraints in the definition of liftCallCC was was preventing building under certain conditions.
• Add Control.Monad.Class.onError.
• Add various instances for Data.Functor.Product.Product.

mtl-2.3.1

2.3.1 -- 2022-10-31

• Add modifyError to Control.Monad.Error.Class, and re-export from
  Control.Monad.Except.
• Make the MonadCont instance for ContT more polykinded; now, r is allowed
  to be of an arbitrary kind k, rather than only Type.
• Add a generic liftCallCC for use with any MonadTrans.
• Return re-export of ExceptT and related functions to Control.Monad.Except.
• Add label function to MonadCont

mtl-2.3.1-rc1

2.3.1 -- 2022-09-10

• Add modifyError to Control.Monad.Error.Class, and re-export from
  Control.Monad.Except.
• Make the MonadCont instance for ContT more polykinded; now, r is allowed
  to be of an arbitrary kind k, rather than only Type.
• Add a generic liftCallCC for use with any MonadTrans.
• Return re-export of ExceptT and related functions to Control.Monad.Except.
• Add label function to MonadCont