libghc-lens-family-core-dev - 2.1.2-1 main

This package provides first-class functional references.
In addition to the usual operations of getting, setting and
composition, plus integration with the state monad, lens families
provide some unique features:
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* Polymorphic updating
* Traversals
* Cast projection functions to read-only lenses
* Cast "toList" functions to read-only traversals
* Cast semantic editor combinators to modify-only traversals.
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This package provides a library for the Haskell programming language.
See http://www.haskell.org/ for more information on Haskell.