The Report says that the Enum instance for Ratio uses the same rule as for Float/Double, namely that [a..b] means takeWhile (<= (b+1/2)) [a, a+1, a+2, ...] You may say that the "<=" should be "<" but that's what the Report says. Certainly if you do [1%3..10%3] you'll get more values than your rule suggests. I'm not sure what your rule should be, though. (What about [2%4, ... 20%4]?) Anyway, it's a bit late to change the Report Simon | -----Original Message----- | From: Ferenc Wagner [mailto:wferi@bolyai1.elte.hu] | Sent: 22 October 2002 11:12 | To: haskell-cafe@haskell.org | Subject: Rational sequence | | With GHC-5.02.2, I do | | $ ghci | Prelude> :m Ratio | Ratio> [1%2..10%2] | [1 % 2,3 % 2,5 % 2,7 % 2,9 % 2,11 % 2] | | The question is, why is there 11%2 at the end of the list? | It's inconsistent with the (good) rules for Integer, since | | Ratio> [1,3..10] | [1,3,5,7,9] | | Is this intentional? | Feri. | _______________________________________________ | Haskell-Cafe mailing list | Haskell-Cafe@haskell.org | http://www.haskell.org/mailman/listinfo/haskell-cafe