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

"(BinTree a)" needs to be in parentheses to pattern-match properly. data BinTree a = Node (BinTree a) (BinTree) a | EmptyBinTree deriving Show On 4/13/12, Kak Dod wrote:

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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