BSD-3-Clause licensed by Edward A. Kmett
Maintained by Edward A. Kmett
This version can be pinned in stack with:lens-action-0.2.3@sha256:e7fd4e0cccca381882d9f74b96adb0b42bb65a65bb4377e1809cfec8eca74bbf,2405

Module documentation for 0.2.3


Hackage Build Status

This package contains combinators and types for working with monadic getters and folds as split off from the original lens package.

Contact Information

Contributions and bug reports are welcome!

Please feel free to contact me through github or on the #haskell IRC channel on

-Edward Kmett


0.2.3 [2018.01.18]

  • Add an Apply context to the Monoid instance for Effect, allowing lens-action to build against lens-4.16.


  • Add a library dependency for the doctests test suite


  • Revamp Setup.hs to use cabal-doctest. This makes it build with Cabal-2.0, and makes the doctests work with cabal new-build and sandboxes.

  • Migrate to new phantom definition in contravariant

  • Add Control.Lens.Action.Type to exposed-modules list.


  • profunctors-5 and lens-4.10 support

  • Add Control.Lens.Action.Type to exposed-modules list.


  • Initial split from lens package