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2.2.1
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* Provide MINIMAL pragmas for `MonadState`, `MonadWriter`, `MonadReader`
* Added a cyclic definition of `ask` in terms of `reader` for consistency with `get`/`put` vs. `state` and `tell` vs. `writer`
* Fix deprecation warnings caused by `transformers` 0.4 deprecating `ErrorT`.
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* Added `Control.Monad.Except` in the style of the other `mtl` re-export modules
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2.2.0.1
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* Fixed a bug caused by the change in how `transformers` 0.4 exports its data types. We will now export `runFooT` for each transformer again!

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2.2
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* `transformers` 0.4 support
* Added instances for `ExceptT`
* Added `modify'` to `Control.Monad.State.*`

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2.1.3.1
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* Avoid importing `Control.Monad.Instances` on GHC 7.8 to build without deprecation warnings.

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2.1.3
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* Removed the now-irrelevant `Error` constraint from the `MonadError` instance for `Either e`.