Are Martin Erwig's "diets" anything close? http://web.engr.oregonstate.edu/~erwig/diet/ On 29 October 2012 04:48, Tony Morris <tonymorris at gmail.com> wrote: > Hi, > I was wondering if anyone knows of a package implementing a fast lookup > for an element in ranges. > > For example, this operation: > Ord a => a -> [(a, a)] -> Bool >