On Thu, 26 May 2005, Shiqi Cao wrote:
Hi,
I tried to port some code from ghc 6.2 to ghc 6.4, but I got the following error
PrelExts.lhs:41:25: Ambiguous occurrence `map' It could refer to either `GHC.Base.map', imported from Data.List at PrelExts.lhs:11:0-15 or `Data.Set.map', imported from Data.Set at PrelExts.lhs:10:0-14
This means that there is a 'map' for lists (Data.List.map) and one for sets (Data.Set). You should import them qualified.
The following is the first part of the code
module PrelExts where
import Data.FiniteMap import Data.Set import Data.List import IO
There is no problem under ghc 6.2. What should I do?
import qualified Data.Set as Set import qualified Data.List as List and call Set.map and List.map