If we assume that you drink beer: let drink beer = True Then we can conclude that it doesn’t matter which hand you drink with: all drink (Left Handed) == all drink (Right Handed) == True On Sat, Apr 1, 2017 at 4:08 AM, Andreas Abel wrote:

GHCi, version 7.10.3: http://www.haskell.org/ghc/ :? for help Prelude> data Handed = Handed Prelude> let drink beer = beer Prelude> all drink (Left Handed) True

-- Andreas Abel <>< Du bist der geliebte Mensch.

Department of Computer Science and Engineering Chalmers and Gothenburg University, Sweden

andreas.abel@gu.se http://www.cse.chalmers.se/~abela/ _______________________________________________ Libraries mailing list Libraries@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/libraries

You are right. But it gets worse! At first I assumed GHCi might just be saying "All left-handed people should be allowed to drink" but now I'm convinced it's biased. Following your definitions: Prelude> any (<3) (Left Handed) Prelude> False Ouch! No love for left-handed people at all! On 2017-04-01 13:08, Andreas Abel wrote:

GHCi, version 7.10.3: http://www.haskell.org/ghc/ :? for help Prelude> data Handed = Handed Prelude> let drink beer = beer Prelude> all drink (Left Handed) True