[Haskell-cafe] Beginner: IORef constructor?

TJ tjay.dreaming at gmail.com
Fri Dec 1 02:08:09 EST 2006

First of all, sorry if this is a really silly question, but I couldn't
figure it out from experimenting in GHCi and from the GHC libraries
documentation (or Google).

Is there an IORef consturctor? Or is it just internal to the Data.IORef module?

I want a "global variable", so I did the following:

module VirtualWorld where
  import Data.IORef
  theWorld = IORef [] -- This will be writeIORef'ed with a populated
list as the user modifies the world.

It doesn't work. GHCi says that the IORef constructor is not in scope.
I did a ":module Data.IORef" and then "IORef []" and it still gives me
the same error.

I'm using GHC 6.6 on Windows.

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