[Haskell-cafe] Removing mtl from the Haskell Platform

[Henning Thielemann]

kahl at cas.mcmaster.ca schrieb:

> 6) I haven't been able to pinpoint it in the Haddock docs,
>    but somehow Control.Monad.State re-exports Control.Monad,
>    which invalidates my explicit Control.Monad imports whenever I import
>    Control.Monad.State full and unqualified --- which I still do since
>    only get, put, and modify appear to be named for qualified import
>    and normally don't clash with other names in my modules.
> 
>    I think providing each implementation (State and StateT)
>    in a separate module, and consequently renaming for qualified import
>    (e.g., StateT.exec) would be desirable.
> 
>    I would not even re-export Control.Monad.Trans from
>    Control.Monad.(State|Cont|...).

In contrast to 'mtl', 'transformers' does not export identifiers from
'Control.Monad' or 'Control.Monad.Trans'.