Re: Proposal: Bounded instance for IntSet (ticket #1953)

On Sun, Dec 02, 2007 at 04:01:05PM -0800, David Benbennick wrote:

On 12/2/07, Ross Paterson wrote:

...

These are the minimum and maximum under the Ord instance (also for Set), but what is the intuition behind that ordering?

The order on IntSet is the well-known lexicographic order (see http://en.wikipedia.org/wiki/Lexicographical_order). If this proposal is accepted, I intend to propose the Bounded instance for Set next (Bounded a => Bounded (Set a)).

This contradicts your code, for the maximal element in the lexicographic order is *not* singleton maxBound, but rather fromList [minBound .. maxBound]. (The libraries agree with your code but not your explanation...) Stefan