Re: [Haskell-cafe] Database.postgreSQL.Simple - ambigious type

On Sat, Aug 17, 2013 at 11:59:24PM +0200, Hartmut Pfarr wrote:

{-# LANGUAGE OverloadedStrings #-}

import Database.PostgreSQL.Simple import Database.PostgreSQL.Simple.FromRow

hello :: (FromRow a) => IO [a] hello = do conn <- connect defaultConnectInfo query_ conn "select 2 + 2"

Either main = print =<< (hello :: IO [Int]) or give hello a monomorphic type signature, such as hello :: IO [Int] Tom