Correct me if I am wrong, but the "time" package already uses extensions beyond Haskell'98. It certainly imports the ReadP library, which requires Rank2,
I was originally going to put the Data instances in "time", but you objected:
http://www.haskell.org/pipermail/libraries/2009-June/011791.html http://www.haskell.org/pipermail/libraries/2009-June/011796.html
What do you recommend?
At the time of that objection, I did not realise that "time" already required Rank2. My preference would be for "time"s dependency on ReadP to be removed in favour of a H'98 parsing combinator library, thus bringing "time" back to true portability. (Back in the autumn, I did spend some time attempting to re-code "time"s parsing code precisely to remove the ReadP dep, but never completed it.) However, you might consider that a step too far, in which case adding the Rank2-requiring Data instances into "time" might be the better solution for you. Regards, Malcolm