[Haskell-cafe] FGL problem: cannot acces data constructor NodeMap

[Immanuel Normann]

Hi,

I have a problem with the data constructor NodeMap
Data.Graph.Inductive.NodeMap
of the graph library fgl-5.4.2.3 (also fgl-5.4.2.2):

I cannot access the data constructor NodeMap, as the ghci session shows:

Prelude> :m Data.Graph.Inductive.NodeMap
Prelude Data.Graph.Inductive.NodeMap> :t NodeMap

<interactive>:1:0: Not in scope: data constructor `NodeMap'


However, when I load the source directly it works:

Prelude> :l Data/Graph/Inductive/NodeMap.hs
[1 of 3] Compiling Data.Graph.Inductive.Graph (
Data/Graph/Inductive/Graph.hs, interpreted )
[2 of 3] Compiling Data.Graph.Inductive.Internal.FiniteMap (
Data/Graph/Inductive/Internal/FiniteMap.hs, interpreted )
[3 of 3] Compiling Data.Graph.Inductive.NodeMap (
Data/Graph/Inductive/NodeMap.hs, interpreted )
Ok, modules loaded: Data.Graph.Inductive.Internal.FiniteMap,
Data.Graph.Inductive.Graph, Data.Graph.Inductive.NodeMap.
*Data.Graph.Inductive.NodeMap> :t NodeMap
NodeMap :: (Ord a) => FiniteMap a Node -> Int -> NodeMap a

Why is that so?

Afterall, my purpose is to get access to the map in a NodeMap and finally to
apply lookup to it. But I don't know how to access the map from a NodeMap
(the map selector isn't accessible either).

Immanuel
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