Data.Map合格的進口與前奏

Question

我想不同用途使用Prelude.map和Data.Map.map在我的代碼衝突，但Data.Map一個合格的進口似乎並沒有幫助：

Prelude> import Data.Map as M 
Prelude M> map 

<interactive>:3:1: 
    Ambiguous occurrence ‘map’ 
    It could refer to either ‘M.map’ 
          imported from ‘Data.Map’ 
          (and originally defined in ‘containers-0.5.0.0:Data.Map.Base’) 
          or ‘Prelude.map’ 
          imported from ‘Prelude’ (and originally defined in ‘GHC.Base’) 

（我還採取了錯誤消息的screenshot，which you can see here）

我想能夠分別使用map和M.map。我怎樣才能做到這一點？

Answer 1

import Data.Map as M從Data.Map中導入名稱都是合格的和不合格的。

要只進口資質的名稱使用：

import qualified Data.Map as M