[Haskell-cafe] Simple Parsec example

[michael rice]

What other imports must I add to get this to run. I can't seem to get it right.
Michael
=========
import Text.ParserCombinators.Parsec.Prim
main = case (parse numbers "" "11, 2, 43") of         Left err  -> print err         Right xs  -> print (sum xs)
numbers = commaSep integer
==============
[michael at sabal ~]$ ghc --make parsetest.hs[1 of 1] Compiling Main             ( parsetest.hs, parsetest.o )
parsetest.hs:7:11: Not in scope: `commaSep'
parsetest.hs:7:20: Not in scope: `integer'[michael at sabal ~]$ 
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