Re: [Haskell-beginners] error: Not in scope: data constructor `BinTree'

13 Apr 2012

      Thank you but

if I change the code like this:

data BinTree a = Node BinTree a BinTree a | EmptyBinTree deriving Show

b1 = Node 3 EmptyBinTreeEmptyBinTree 

Then I am get this error:

bintree.hs:1:23:
    `BinTree' is not applied to enough type arguments
    Expected kind `?', but `BinTree' has kind `k0 -> *'
    In the type `BinTree'
    In the definition of data constructor `Node'
    In the data type declaration for `BinTree'
Failed, modules loaded: none. 

________________________________
 From: Kyle Murphy 
To: Kak Dod  
Cc: "beginners@haskell.org"  
Sent: Friday, 13 April 2012 4:38 PM
Subject: Re: [Haskell-beginners] error: Not in scope: data constructor `BinTree'

Your constructor is called Node, not BinTree.
data BinTree a = Node a (BinTree a) (BinTree a) | EmptyNode
b1 = Node 3 EmptyNode EmptyNode
-R. Kyle Murphy
Sent from my phone.
On Apr 13, 2012 12:24 PM, "Kak Dod"  wrote:

if i compile the following code I get "bintree.hs:3:13: Not in scope: data constructor `BinTree'"
...
data BinTree a = Node BinTree a BinTree a | EmptyBinTree deriving Show
b1 = (Node (BinTree 3) EmptyBinTree)
please help
-kak
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