Proposal for removing transformers dependency

Herbert Valerio Riedel hvriedel at
Wed Jan 21 16:14:53 UTC 2015

On 2015-01-21 at 16:51:55 +0100, Alexander V Vershilov wrote:


> As transformers usage are quite limited in ghc, and it's really relevant
> in ghc-bin, it's possible to duplicate the code, and provide required
> fixes in ghc-bin.cabal. As a result ghc uses it's own MonadIO, MonadControl
> and Strict State, and ghc-bin.cabal (ghc/*) uses ones from
> transformers.

...but doesn't this effectively mean that the instances provided by the
`ghc` package are of little use or rather can't be easily combined with
code that builds on top of the original `transformers` classes everyone
else uses?


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