[Haskell] Read Instances for Data.Map and Data.Set

[Johannes Waldmann]

Georg made the point that if a type is an instance of Show,
then it should also be an instance of Read, and  read . show == id
I'd like to repeat my earlier point that it would be better
if the user of the type can decide whether he wants
some predefined Show/Read instances or roll his own.
http://www.haskell.org/pipermail/libraries/2005-March/003496.html
Best regards,
-- 
-- Johannes Waldmann -- Tel/Fax (0341) 3076 6479/80 --
---- http://www.imn.htwk-leipzig.de/~waldmann/ -------