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

[Kak Dod]

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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