libghc-aeson-pretty-dev 0.7.2-4 (amd64 binary) in ubuntu wily

 A JSON pretty-printing library compatible with Aeson.
 .
 The library provides the function encodePretty. It is a drop-in
 replacement for aeson's encode function, producing JSON-ByteStrings
 for human readers.
 .
 This package provides a library for the Haskell programming language.
 See http://www.haskell.org/ for more information on Haskell.