On May 18, 2009, at 21:19 , michael rice wrote:

*Main> :t ints 0
ints 0 :: Chain
*Main> ints 0

<interactive>:1:0:
No instance for (Show Chain)

In general, you want to append

deriving Show

to your types. You may also want to be able to input them in ghci, so instead say

deriving (Show, Read)

brandon s. allbery [solaris,freebsd,perl,pugs,haskell] allbery@kf8nh.com

system administrator [openafs,heimdal,too many hats] allbery@ece.cmu.edu

electrical and computer engineering, carnegie mellon university KF8NH