5.3.7 [2022.01.09]

• Relax the Bind constraints in the following instances to Functor:

  -instance (Bind f,    Monad f) => Alt  (MaybeT f)
  -instance (Bind f,    Monad f) => Plus (MaybeT f)
  +instance (Functor f, Monad f) => Alt  (MaybeT f)
  +instance (Functor f, Monad f) => Plus (MaybeT f)
  
  -instance (Bind f,    Monad f, Semigroup e)           => Alt  (ExceptT e f)
  -instance (Bind f,    Monad f, Semigroup e, Monoid e) => Plus (ExceptT e f)
  +instance (Functor f, Monad f, Semigroup e)           => Alt  (ExceptT e f)
  +instance (Functor f, Monad f, Semigroup e, Monoid e) => Plus (ExceptT e f)
  
   -- If building with transformers-0.5.* or older
  -instance (Bind f,    Monad f)          => Alt  (ErrorT e f)
  -instance (Bind f,    Monad f, Error e) => Plus (ErrorT e f
  +instance (Functor f, Monad f)          => Alt  (ErrorT e f)
  +instance (Functor f, Monad f, Error e) => Plus (ErrorT e f)
  

5.3.6 [2021.10.07]

• Allow building with GHC 9.2.
• Allow building with transformers-0.6.*.
• Add Alt instance for Identity.
• Add Conclude, Decide and Divise type classes and instances.
• Add (<.*>), (<*.>), and traverseMaybe functions, which make it easier to defined Traversable1 instances for data types that have fields with a combination of Traversable and Traversable1 instances.
• Add Semigroupoids.Do module with overloads for use with QualifiedDo.
• Add Apply, Alt, Plus, Bind and BindTrans instances for the CPS versions of WriterT and RWST.
• Add psum function to Data.Functor.Plus.
• Add Categorical data type.

5.3.5 [2020.12.31]

• The build-type has been changed from Custom to Simple. To achieve this, the doctests test suite has been removed in favor of using cabal-docspec to run the doctests.
• Explicitly mark modules as Safe.

5.3.4 [2019.11.26]

• Achieve forward compatibility with GHC proposal 229.

5.3.3 [2019.08.27]

• Add Alt and Plus instances for HashMap from the unordered-containers package.

5.3.2 [2019.01.04]

• Bump the lower bound on semigroups to 0.16.2, and avoid incurring the dependency entirely on recent GHCs.
• Fix the build on GHC 7.0 and 7.2.

5.3.1 [2018.07.02]

• Fix a regression introduced in semigroupoids-5.3 in which some modules regressed from Trustworthy to Unsafe.

5.3 [2018.07.02]

• Allow building with containers-0.6.
• Add Alt instances for First and Last from Data.Semigroup, and Alt and Plus instances for First and Last from Data.Monoid.
• Add missing Apply, Bind, Extend, Foldable1 and Traversable1 instances for Data.Semigroups, Data.Monoid and GHC.Generics.

5.2.2 [2018.01.18]

• Add optional to Data.Functor.Alt (analogous to the optional function in Control.Applicative)
• liftF2 is now a class method of Apply (mirroring the fact that liftA2 is now a class method of Applicative). liftF2 and (<.>) have default definitions in terms of the other.
• Allow building with GHC 8.4
• Apply and Bind instances for Q, from the template-haskell package. (As a consequence, Data.Semigroup.Foldable is no longer a Trustworthy module.)
• Add instances for (:~:) and (:~~:) from Data.Type.Equality, and Coercion from Data.Type.Coercion

5.2.1

• Add the toNonEmpty method to Foldable1. Add foldrM1 and foldlM1 functions to Data.Semigroup.Foldable that are defined in terms of toNonEmpty.
• Add Apply, Bind, Foldable1, and Traversable1 instances for Complex
• Add Apply and Bind instances for HashMap from the unordered-containers package (on which semigroupoids now depends)
• Add Semigroupoid instances for Tagged and Const

5.2

• Revamp Setup.hs to use cabal-doctest. This makes it build with Cabal-1.25, and makes the doctests work with cabal new-build and sandboxes.
• Added instances to Alt, Plus, Apply, Bind and Extend for GHC.Generics, Tagged and Proxy where appropriate.

5.1

• The remaining orphan instances in Data.Traversable.Instances have been replaced in favor of the orphan instances from transformers-compat-0.5.
• The documentation now states laws that instances of Apply are expected to uphold.
• doctest-0.11 support
• Fixed compilation of tests with stack

5.0.1

• transformers-compat 0.5 support
• Removed some redundant constraints.
• GHC 8 support

5.0.0.4

• doctest 0.10 support

5.0.0.2

• Bugfix for GHC 7.4. PolyKinds on 7.4 cause all sorts of haskell interface file errors. One of the #if guards that turned it off on 7.4 was missing and has been fixed.

5.0.0.1

• Added the CHANGELOG to the distribution so that hackage can link to it in the haddocks.

5

• Absorbed Data.Bifunctor.Apply, Data.Semigroup.Bifoldable and Data.Semigroup.Traversable from bifunctors.
• This caused us to pick up a dependency on tagged.
• Exiled Data.Semifunctor.*, Data.Semigroupoid.Product and Data.Semigroupoid.Coproduct to semigroupoid-extras.
• This let us open up to older versions of GHC again.
• Set an explicit fixity for -<- and ->-.

4.5

• Major changes to the API to support PolyKinds and DataKinds. This necessarily shuts off GHC <= 7.4.
• Orphan instances have moved upstream into a common base-orphans package.

4.3.1

• Added asum1 to Data.Semigroup.Foldable.

4.3.0.1

• Support for ‘ConstrainedClassMethods’ is currently required for GHC HEAD.

4.3

• Added missing instances for ExceptT. Obtain it via transformers-compat if need be for old transformers versions.
• Several Bind and Apply instances now require somewhat more minimal contexts.

4.2

• Backported Foldable/Traversable instances from lens

4.1

• Foldable1/Traversable1 for tuples

4.0.4

• contravariant 1.0 support.

4.0.3

• Added flags to provide unsupported cabal sandbox build modes.

4.0.1

• Fixed bitrot in the Data.Functor.Extend documentation.
• Fixed warnings on GHC 7.8.1rc2 caused by importing Control.Monad.Instances.

4.0

• Merged in the contents of the groupoids and semigroupoid-extras packages.

3.1

• Added the rectangular band Semigroupoid for (,). Would that make it a Bandoid?

3.0.3

• Claim to be Trustworthy where necessary

3.0.2

• Tightened the upper bounds slightly to enable PVP compliance while retaining a flexible development cycle.
• Raised the upper bound on contravariant.

3.0.1

• Removed upper bounds relative to my other packages
• Refactored directory layout