0.6.6 [2020.09.30]

• Add FunctorClassesDefault, an adapter newtype suitable for DerivingVia, to Data.Functor.Classes.Generic.
• Fix a bug in which readsPrec1Default/liftReadsPrecDefault would parse empty data types too strictly.

0.6.5 [2019.05.11]

• Ensure that the backported MonadFail instance for ExceptT is available when built against transformers-0.4.*.

0.6.4 [2019.04.01]

• Use more conservative CPP to guard the backported MonadFix instance for ListT.

0.6.3 [2019.04.01]

• Backport changes from transformers-0.5.6.*:
  • Backport the MonadFix instance for ListT in Control.Monad.Trans.Instances.
  • Generalize the type of except in Control.Monad.Trans.Except.
• Backport MonadFail instances for AccumT, Reverse, and SelectT on pre-8.0 versions of GHC by depending on the fail package if necessary.
• Backport MonadFail instances for monad transformer types in Control.Monad.Trans.Instances.

0.6.2

• transformers-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 transformers-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 transformers-compat with the appropriate flags should help.)

0.6.1.6

• Each of versions 0.6.1.2–0.6.1.6 is a 0.6.1 build with a different set of flags configured. Building this way allows us to work around bugs in cabal's backtracker. The 0.6.1 release notes describe the changes in this version. This release is configured with none of -ftwo, -fthree, -ffour, or -ffive (which works with transformers-0.5.3 and above).

0.6.1.5

• Each of versions 0.6.1.2–0.6.1.6 is a 0.6.1 build with a different set of flags configured. Building this way allows us to work around bugs in cabal's backtracker. The 0.6.1 release notes describe the changes in this version. This release is configured with -ffive (which works with transformers-0.5 up until, but not including, transformers-0.5.3).

0.6.1.4

• Each of versions 0.6.1.2–0.6.1.6 is a 0.6.1 build with a different set of flags configured. Building this way allows us to work around bugs in cabal's backtracker. The 0.6.1 release notes describe the changes in this version. This release is configured with -ffour (which works with the transformers-0.4 series).

0.6.1.3

• Each of versions 0.6.1.2–0.6.1.6 is a 0.6.1 build with a different set of flags configured. Building this way allows us to work around bugs in cabal's backtracker. The 0.6.1 release notes describe the changes in this version. This release is configured with -fthree (which works with the transformers-0.3 series).

0.6.1.2

• Each of versions 0.6.1.2–0.6.1.6 is a 0.6.1 build with a different set of flags configured. Building this way allows us to work around bugs in cabal's backtracker. The 0.6.1 release notes describe the changes in this version. This release is configured with -ftwo (which works with the transformers-0.2 series).

0.6.1

• Fix an oversight in which the Control.Monad.Trans.Accum and Control.Monad.Trans.Select modules were not backported when built with the -ffour flag.

0.6.0.6

• Each of versions 0.6.0.2–0.6.0.6 is a 0.6 build with a different set of flags configured. Building this way allows us to work around bugs in cabal's backtracker. The 0.6 release notes describe the changes in this version. This release is configured with none of -ftwo, -fthree, -ffour, or -ffive (which works with transformers-0.5.3 and above).

0.6.0.5

• Each of versions 0.6.0.2–0.6.0.6 is a 0.6 build with a different set of flags configured. Building this way allows us to work around bugs in cabal's backtracker. The 0.6 release notes describe the changes in this version. This release is configured with -ffive (which works with transformers-0.5 up until, but not including, transformers-0.5.3).

0.6.0.4

• Each of versions 0.6.0.2–0.6.0.6 is a 0.6 build with a different set of flags configured. Building this way allows us to work around bugs in cabal's backtracker. The 0.6 release notes describe the changes in this version. This release is configured with -ffour (which works with the transformers-0.4 series).

0.6.0.3

• Each of versions 0.6.0.2–0.6.0.6 is a 0.6 build with a different set of flags configured. Building this way allows us to work around bugs in cabal's backtracker. The 0.6 release notes describe the changes in this version. This release is configured with -fthree (which works with the transformers-0.3 series).

0.6.0.2

• Each of versions 0.6.0.2–0.6.0.6 is a 0.6 build with a different set of flags configured. Building this way allows us to work around bugs in cabal's backtracker. The 0.6 release notes describe the changes in this version. This release is configured with -ftwo (which works with the transformers-0.2 series).

0.6

• Introduce the Data.Functor.Classes.Generic module, which provides functions that can generically implement methods in the Eq1, Ord1, Read1, and Show1 classes (without the usual boilerplate involved).
• Introduce the generic-deriving flag. When enabled, transformers-compat will depend on the generic-deriving library on older versions of GHC to backport GHC.Generics support for Generic instances and the machinery in Data.Functor.Classes.Generic.
• Some instances were present in Data.Functor.Sum but not in Control.Monad.Trans.Instances (e.g., the Generic, Typeable, and Data instances for Sum). This has been fixed.
• Backport changes from transformers-0.5.5:
  • Backport the Semigroup instance for Constant
  • Add mapSelect and mapSelectT
  • Define selectToContT (and deprecate selectToCont in favor of that)
  • Define some explicit (*>) definitions to avoid space leaks
• Backport changes from transformers-0.5.4 (i.e., add Bifoldable and Bitraversable instances for Data.Functor.Constant)
• Backport changes from transformers-0.5.3:
  • Backport the Control.Monad.Trans.Accum and Control.Monad.Trans.Select modules
  • Backport the eitherToErrors and elimLift functions to Control.Applicative.Lift
  • Backport Bits, FiniteBits, IsString, Num, Real, Integral, Fractional, Floating, RealFrac, and RealFloat instances for Data.Functor.Identity
  • Backport Monad, MonadFail, and MonadPlus instances for Data.Functor.Reverse
  • Backport Eq1, Ord1, Read1, and Show1 instances for Data.Proxy
• Backport changes from transformers-0.5.2 (i.e., add more INLINE annotations)
• Backport changes from transformers-0.5.1 (i.e., add Bounded, Enum, Ix, and Storable instances for Identity)

0.5.1.4

• Each of versions 0.5.1.2–0.5.1.4 is a 0.5.1 build with a different set of flags configured. Building this way allows us to work around bugs in cabal's backtracker. The 0.5.1 release notes describe the changes in this version. This release is configured with neither -ftwo nor -fthree (which works with transformers-0.4 and above).

0.5.1.3

• Each of versions 0.5.1.2–0.5.1.4 is a 0.5.1 build with a different set of flags configured. Building this way allows us to work around bugs in cabal's backtracker. The 0.5.1 release notes describe the changes in this version. This release is configured with -fthree (which works with the transformers-0.3 series).

0.5.1.2

• Each of versions 0.5.1.2–0.5.1.4 is a 0.5.1 build with a different set of flags configured. Building this way allows us to work around bugs in cabal's backtracker. The 0.5.1 release notes describe the changes in this version. This release is configured with -ftwo (which works with the transformers-0.2 series).

0.5.1

• Fix a bug in which PolyKinds was enabled on GHC 7.4, resulting in interface file bugs on that version of GHC.

0.5.0.4

• Each of versions 0.5.0.2–0.5.0.4 is a 0.5 build with a different set of flags configured. Building this way allows us to work around bugs in cabal's backtracker. The 0.5 release notes describe the changes in this version. This release is configured with neither -ftwo nor -fthree (which works with transformers-0.4 and above).

0.5.0.3

• Each of versions 0.5.0.2–0.5.0.4 is a 0.5 build with a different set of flags configured. Building this way allows us to work around bugs in cabal's backtracker. The 0.5 release notes describe the changes in this version. This release is configured with -fthree (which works with the transformers-0.3 series).

0.5.0.2

• Each of versions 0.5.0.2–0.5.0.4 is a 0.5 build with a different set of flags configured. Building this way allows us to work around bugs in cabal's backtracker. The 0.5 release notes describe the changes in this version. This release is configured with -ftwo (which works with the transformers-0.2 series).

0.5

• Update transformers-compat to incorporate changes from the transformers-0.5 series. These changes include:
  • The Data.Functor.Classes module was completely redesigned.
  • Modules now have Safe or Trustworthy annotations.
  • Data types and type synonyms are poly-kinded when possible.
• Add Control.Monad.Trans.Instances, a module of orphan instances that mimic instances available in later versions of transformers.

0.4.0.4

• Each of versions 0.4.0.2–0.4.0.4 is a 0.4 build with a different set of flags configured. Building this way allows us to work around bugs in cabal's backtracker. The 0.4 release notes describe the changes in this version. This release is configured with neither -ftwo nor -fthree (which works with transformers-0.4 and above).

0.4.0.3

• Each of versions 0.4.0.2–0.4.0.4 is a 0.4 build with a different set of flags configured. Building this way allows us to work around bugs in cabal's backtracker. The 0.4 release notes describe the changes in this version. This release is configured with -fthree (which works with the transformers-0.3 series).

0.4.0.2

• Each of versions 0.4.0.2–0.4.0.4 is a 0.4 build with a different set of flags configured. Building this way allows us to work around bugs in cabal's backtracker. The 0.4 release notes describe the changes in this version. This release is configured with -ftwo (which works with the transformers-0.2 series).

0.4

• Added support for the missing ExceptT instances from mtl.

  This was not done lightly. While this means that by default incurring a dependency on transformers-compat drags in mtl when you are using an old transformers, it means that users do not have to orphan these instances and permits wider adoption of ExceptT.

  If you absolutely can't stand mtl and really want this package to build as valid Haskell98, then you can use cabal install transformers-compat -f-mtl to avoid incurring the dependency to get these instances. However, that is effectively an unsupported configuration.

0.3.3.4

• Versions 0.3.3.2–0.3.3.4 were a successful attempt to fix build problems caused by the cabal backtracker.
• Each of these is a build with a different set of flags configured. This release is configured with neither -ftwo nor -fthree (which works with transformers-0.4 and above).

0.3.3.3

• Versions 0.3.3.2–0.3.3.4 were a successful attempt to fix build problems caused by the cabal backtracker.
• Each of these is a build with a different set of flags configured. This release is configured with -fthree (which works with the transformers-0.3 series).

0.3.3.2

• Versions 0.3.3.2–0.3.3.4 were a successful attempt to fix build problems caused by the cabal backtracker.
• Each of these is a build with a different set of flags configured. This release is configured with -ftwo (which works with the transformers-0.2 series).

0.3.2

• This release was a failed (or at least, only partially successful) attempt to fix build problems caused by the cabal backtracker.

0.3.1

• transformers 0.4.1 compatibility

0.3

• Added the instances for Data.Functor.Classes from transformers 0.4
• Switched Control.Applicative.Backwards and Data.Functor.Reverse to the split constructor/accessor style from transformers 0.4.

0.2

• Added the new types and classes from transformers 0.4

0.1.1.1

• Wrote a better synopsis

0.1.1

• Updated to trick cabal into building an empty libHStransformers-compat-0.1.a on GHC 7.6.

0.1

• Repository initialized by pulling the transformers-0.2 compatibility layer out of lens.