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+module gastje
+
+/*
+	Pieter Koopman, Radboud University, 2016, 2017
+	pieter@cs.ru.nl
+	Advanced programming
+	A simplified MBT tool based on logical properties
+*/
+
+import StdEnv, StdGeneric, GenEq
+
+test :: p -> [String] | prop p
+test p = check 1000 (holds p prop0)
+
+check :: Int [Prop] -> [String]
+check n [] = ["Proof\n"]
+check 0 l  = ["Passed\n"]
+check n [p:x] | p.bool
+	= check (n-1) x
+	= ["Fail for: ":reverse ["\n":p.info]]
+
+class prop a where holds :: a Prop -> [Prop]
+
+instance prop Bool where holds b p = [{p & bool = b}]
+
+instance prop (a->b) | prop b & testArg a 
+where
+	holds f p = diagonal [holds (f a) {p & info = [" ",string{|*|} a:p.info]} \\ a <- gen{|*|}]
+
+class testArg a | gen{|*|}, string{|*|}, gEq{|*|} a
+
+:: Prop =
+	{ bool :: Bool
+	, info :: [String]
+	}
+prop0 = {bool = True, info = []}
+
+generic gen a :: [ a ]
+gen{|Int|}  = [0,1,-1,maxint,minint,maxint-1,minint+1:[j\\i<-[2..], j<-[i,~i]]]
+gen{|Bool|} = [True,False]
+gen{|Char|} = [' '..'~'] ++ ['\t\n\b']
+gen{|UNIT|} = [UNIT]
+gen{|PAIR|}   f g = map (uncurry PAIR) (diag2 f g)
+gen{|EITHER|} f g = merge (map RIGHT g) (map LEFT f)
+where
+	merge [a:x] ys = [a: merge ys x]
+	merge []    ys = ys
+gen{|CONS|}   f  = map CONS f
+gen{|OBJECT|} f  = map OBJECT f
+gen{|RECORD|} f  = map RECORD f
+gen{|FIELD|}  f  = map FIELD f
+
+generic string a :: a -> String
+string{|Int|} i = toString i
+string{|Bool|} b = toString b
+string{|Char|} c = toString ['\'',c,'\'']
+string{|UNIT|} _ = ""
+string{|PAIR|} f g (PAIR x y) = f x + " " + g y
+string{|EITHER|} f g (LEFT x) = f x
+string{|EITHER|} f g (RIGHT y) = g y
+string{|CONS of gcd|} f (CONS x)
+| gcd.gcd_arity > 0 = "(" + gcd.gcd_name + " " + f x + ")"
+| otherwise         = gcd.gcd_name
+string{|OBJECT|} f (OBJECT x) = f x
+string{|RECORD of grd|} f (RECORD x) = "{" + grd.grd_name + "|" + f x + "}"
+string{|FIELD of gfd|} f (FIELD x) = gfd.gfd_name + " = " + f x + " "
+
+maxint :: Int
+maxint =: IF_INT_64_OR_32 (2^63-1) (2^31-1) //2147483647
+
+minint :: Int
+minint =: IF_INT_64_OR_32 (2^63) (2^31) //-2147483648
+
+instance + String where + s t = s +++ t
+
+diagonal :: [[a]] -> [a]
+diagonal list = f 1 2 list []
+where
+	f n m [] [] = []
+	f 0 m xs ys = f m (m+1) (rev ys xs) []
+	f n m [] ys = f m (m+1) (rev ys []) []
+	f n m [[x:r]:xs] ys = [x: f (n-1) m xs [r:ys]]
+	f n m [[]:xs] ys = f (n-1) m xs ys
+
+	rev []    accu = accu
+	rev [x:r] accu = rev r [x:accu]
+
+Start = ()