Curry is an experimental functional logic programming language, based on the Haskell language. It merges elements of functional and logic programming, including constraint programming integration. It is nearly a superset of Haskell, lacking support mostly for overloading using type classes, which some implementations provide anyway as a language extension, such as the Münster Curry Compiler.. Read more on Wikipedia...
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main :: IO () main = putStrLn "Hello, world!"
-- "Hello World" demo for the Tcl/Tk library import Tk main = runWidget "Hello" (TkCol  [TkLabel [TkText "Hello World"], TkButton tkExit [TkText "Stop"]])
insert x ys = x : ys insert x (y:ys) = y : insert x ys