microlens support for Reader/Writer/State from mtl

 This package contains functions (like 'view' or '+=') which work on
 'MonadReader', 'MonadWriter', and 'MonadState' from the mtl package.
 .
 This package is a part of the microslens family.
 .
 This package provides a library for the Haskell programming language.
 See http://www.haskell.org/ for more information on Haskell.