Hi, I'd like to use QuickCheck for testing Haskell programs. I'm using Hugs in Windows. I'm a newbie to Haskell. Just running QuickCheck.hs itself, which comes with the Hugs98 libraries, I get an error message and the Monad command line, which indicates that quickcheck didn't load. ERROR "C:\Program Files\Hugs98/libraries\QuickCheck.hs":147 - Undefined variable "chr" Monad> Here is the line in QuickCheck.hs which leads to the error. instance Arbitrary Char where arbitrary = choose (32,255) >>= \n -> return (chr n) coarbitrary n = variant (ord n) This code is from the website: http://www.cs.chalmers.se/~rjmh/QuickCheck/QuickCheck.hs I tested it with the following module, as per the instructions in on QuickCheck's manual page: ---- module TestQuickCheck where import QuickCheck prop_RevRev xs = reverse (reverse xs) == xs where types = xs::[Int] ---- Loading just this, I get the same error: Prelude> :l TestQuickCheck ERROR "C:\Program Files\Hugs98/libraries\QuickCheck.hs":147 - Undefined variable "chr" Monad> I know others report using QuickCheck, so this problem must have been resolved. Also, I guess the quickcheck script is for Linux alone? Any scripts for Hugs in Windows? Cheers, Adam