-- Use instead of amap when the array implementation needs to change.
-- E.g., mapping an unboxed array to an array whose elements must be boxed.
amap2 f arr = funcArray (bounds arr) (\i -> f (arr ! i))
+
+-- Like amap2 but the mapping function is also passed the index.
+aixmap f arr = funcArray (bounds arr) (\i -> f i (arr ! i))