Matthew Bromberg wrote:
4) Hmm, a simple example I tried actually worked, however I have a file that has this header module Parsefile where import System.IO import System.IO.Unsafe import Text.ParserCombinators.Parsec import Data.HashTable ...
For some reason it requires that I use the fully qualified name Data.HashTable.lookup instead of just lookup to get the correct functionality.
The reason is that the standard Prelude also provides function called 'lookup'. [*] You could hide it by explicitely importing the Prelude: import Prelude hiding (lookup) Another solution is to import the HashTable module with a shorter name to save typing (and avoid noise) in the Code: import Data.HashTable as H allows you to use H.lookup for the lookup. If you make the import qualified, import qualified Data.HashTable as H you are forced to use that prefix, but you can use the Prelude's lookup without any prefix again. By specifying the names to import you can create any mix of prefixed and non-prefixed functions you want. Another useful thing to know is that you can import different modules with the same name (beware of conflicting symbols though). For example, adding import Data.HashTable (HashTable) to the qualified import allows you to use the type 'HashTable' without the 'H.' prefix. regards, Bertram [*] it'd be nice if the name resolution could be guided by the type checker - but that's probably hard. Has anyone tried that?