On 2004-04-28T23:33:31-0400, S. Alexander Jacobson wrote:
I don't think this works. I just tried it with: main = print $ lookupRead 1 [(1,("Integer","100"))]
This fails for the same reason print $ read "100" fails. You need to give a type signature to avoid type-class instance ambiguity: main = print $ (lookupRead 1 [(1,("Integer","100"))] :: Maybe Integer) On GHCi 6.2.1, the above yields "Just 100" for me. -- Edit this signature at http://www.digitas.harvard.edu/cgi-bin/ken/sig Be it declared and enacted by this present Parliament / That the People of England / are / a Commonwealth and free State / without any King or House of Lords. -- An Act declaring England to be a Commonwealth 1649-05-19 | 355 years | 2004-05-19 http://tinyurl.com/2dqnh