{"name":"gist: 984072","desc":"Lenses with failure - a la Twan van Laarhoven","actor":"sjoerdvisscher","url":"https://gist.github.com/984072","snippet":"{-# LANGUAGE RankNTypes #-}\n\nimport Control.Applicative","actor_gravatar":"ba340386ad2afc76d4a9602410b4e449","action":"update"}