Am Freitag, 27. Mai 2005 02:06 schrieb Shiqi Cao:
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
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?
Shiqi Cao
The module Set has undergone major changes - look at the code and admire, if you have it. Formerly sets were implemented as 'FiniteMap's, now as size-balanced trees. Formerly there was a function called 'mapSet', now there's 'map'. To solve your problem, use import controls, for example import Data.Set hiding (map) import qualified Data.Set as Set will do fine. BTW, module FiniteMap is deprecated (I don't know why). Cheers, Daniel