On Wed, Sep 2, 2009 at 1:21 PM, KwangYul Seo<kwangyul.seo at gmail.com> wrote: > The error message says that it is hidden. How can I use the FiniteMap? FiniteMap has been superceded by Data.Map, this is probably what you want to use (or Data.IntMap if your keys are Int). -- Jedaï