Changelog for mtl-compat-0.2.2

mtl-compat now uses automatic flags instead of manual ones. This has a number of benefits:
- There is no need for making several simultaneous releases to support each flag combination.
- As a result, the cabal-install constraint solver should have a much easier time figuring out install-plans involving mtl-compat.
Due to old cabal-install bugs, cabal-install-1.16 and older may have a harder time installing this package, so it is recommended that you use cabal-install-1.18 or later. (Or, if you must use cabal-install-1.16 or older, installing mtl-compat with the appropriate flags should help.)

A specific build with no flags explicitly enabled, intended for use with the latest version of mtl. This is a workaround for cabal backtracker bugs.

A specific build with the -ftwo-point-two flag explicitly enabled. This is a workaround for cabal backtracker bugs.

A specific build with the -ftwo-point-one flag explicitly enabled. This is a workaround for cabal backtracker bugs.

0.2.1

Require use of transformers-compat-0.4 or greater when building with mtl-2.1.3.1 or earlier. transformers-compat-0.4.0.* adds the missing ExceptT instances, which means that mtl-compat's only purpose is to backport the Control.Monad.Except module for those who want an mtl-style import for ExceptT and/or MonadError.

I would recommend just using Control.Monad.Trans.Except from transformers-compat-0.4.0.* and Control.Monad.Error.Class instead, since they accomplish the same thing as mtl-compat without an extra dependency.