Re: [Haskell-cafe] Not in scope: type constructor or class `Map'

On Thu, 30 Dec 2010 08:01:01 -0800 (PST) michael rice wrote:

Not sure what's going on here. Doesn't like line 5, the type statement. And what's with the semicolons in that line and in function main?

import Control.Monad.Reader import qualified Data.Map as Map import Data.Maybe

type Bindings = Map String Int;

. The right hand side should be "Map.Map String Int"; alternatively add an unqualified import above for just the Map type:

import Data.Map(Map)

The semicolon is optional---the layout rule will insert it if you leave it out. Pedro