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+/**
+ * Mart Lubbers, s4109503
+ * Camil Staps, s4498062
+ */
+
+implementation module VectorOverloading
+
+import StdEnv
+
+:: Vector2 a = {x0 :: a, x1 :: a}
+
+instance ==   (Vector2 a) | == a   where 
+	== a b = a.x0 == b.x0 && a.x1 == b.x1
+instance zero (Vector2 a) | zero a where 
+	zero = {x0 = zero, x1 = zero}
+instance one  (Vector2 a) | one a  where 
+	one = {x0 = one, x1 = one}
+instance ~    (Vector2 a) | ~ a    where 
+	~ a = {x0 = ~a.x0, x1 = ~a.x1}
+instance +    (Vector2 a) | + a    where 
+	+ a b = {x0 = a.x0 + b.x0, x1 = a.x1 + b.x1}
+instance -    (Vector2 a) | - a    where 
+	- a b = {x0 = a.x0 - b.x0, x1 = a.x1 - b.x1}
+instance *    (Vector2 a) | * a    where 
+	* a b = {x0 = a.x0 * b.x0, x1 = a.x1 * b.x1}
+instance /    (Vector2 a) | / a    where 
+	/ a b = {x0 = a.x0 / b.x0, x1 = a.x1 / b.x1}
+
+Start  = test {x0=1,x1=2}
+
+test a = ( zero + a == a    && a    == a + zero
+         , a - zero == a    && a    == ~ (zero - a)
+         ,  one * a == a    && a    == a * one
+         , zero * a == zero && zero == a * zero
+         ,  a / one == a
+         ,  ~ (~ a) == a
+         )