\begin{code}
-- | The 'Ix' class is used to map a contiguous subrange of values in
-- a type onto integers. It is used primarily for array indexing
--- (see "Data.Array", "Data.Array.IArray" and "Data.Array.MArray").
+-- (see the array package).
--
-- The first argument @(l,u)@ of each of these operations is a pair
-- specifying the lower and upper bounds of a contiguous subrange of values.