4.3.16

• Fix example code for every
• Improved documentation for ListT

4.3.15

• Build against ghc-9.0

4.3.14

• Add mapMaybe and wither, and more laws for filter and filterM.

4.3.13

• Add MonadFail instance for Proxy

4.3.12

• Fix space leak introduced in version 4.3.10
  • This leak primarily affects the use of forever

4.3.11

• Fix documentation for scanM

4.3.10

• Relax Monad constraints to Functor
• Support GHC 8.8

4.3.9

• Increase upper bound on exceptions

4.3.8

• Increase upper bound on exceptions

4.3.7

• Documentation fix

4.3.6

• Fix implementation of pass in MonadWriter instance for Proxy

4.3.5

• Support Semigroup being a super-class of Monoid

4.3.4

• Increase upper bound on mmorph

4.3.3

• Make X a synonym for Data.Void.Void

4.3.2

• BUG FIX: Fix MMonad instance for ListT
  • The old instance was an infinite loop

4.3.1

• Support building against ghc-7.4

4.3.0

• BREAKING CHANGE: Remove Alternative/MonadPlus instances for Proxy
  • See commit 08e7302f43dbf2a40bd367c5ee73ee3367e17768 which explains why
• Add Traversable instance for ListT
• New MonadThrow/MonadCatch/MMonad/Semigroup/MonadZip instances for ListT
• New MonadThrow/MonadCatch instances for Proxy
• Fix lower bound on mtl
• Increase upper bound on optparse-applicative

4.2.0

• BREAKING CHANGE: Switch from ErrorT to ExceptT
• Add Foldable instance for ListT
• Fix all warnings
• Enable foldr/build fusion for toList

4.1.9

• Increase lower bound on criterion
• Increase upper bound on transformers for tests/benchmarks
• Optimize code by delaying INLINABLE annotations

4.1.8

• Increase upper bound on transformers
• Prepare for MRP (Monad of no Return Proposal)

4.1.7

• Increase lower bound on deepseq
• Add unfoldr
• Add loop
• Add toListM'
• Improve efficiency of drop
• License tutorial under Creative Commons license

4.1.6

• Increase lower bound on base
• Add diagrams to Pipes.Core documentation
• Add mapM_
• Add takeWhile'
• Add seq
• Improve efficiency of toListM

4.1.5

• Increase upper bound on criterion

4.1.4

• Increase upper bound on criterion
• Add Monoid instance for Proxy

4.1.3

• Increase lower bound on mtl
• Re-export void
• Add fold'
• Add foldM'

4.1.2

• Increase upper bounds on transformers and mtl

4.1.1

• Add runListT
• Add MMonad instance for Proxy
• Add repeatM
• Add laws to documentation of Pipes.Prelude utilities

4.1.0

• Remove Haskell98 support
• Use internal X type instead of Data.Void
• Document Pipes.Lift module:w
• Add drain
• Add sequence

4.0.2

• Improve performance of each
• Add tutorial appendix explaining how to work around quadratic time complexity

4.0.1

• Remove WriterT and RWST benchmarks
• Add Enumerable instance for ErrorT
• Add cabal flag for Haskell98 compilation
• Add several rewrite rules
• Add mtl instances for ListT
• Fix implementation of pass, which did not satisfy Writer laws
• Implement fail for ListT
• Add type synonym table to tutorial appendix
• Add QuickCheck tests for pipes laws
• Add mapFoldable
• Add Monoid instance for ListT
• Add manual proofs of pipes laws in laws.md

4.0.0

Major upgrade of pipes to no longer use Proxy type class