I thank people who explained the question of importing the List
constructor.
There remains a very practical question of how to improve the
program
-----------------------------------------------------------
import qualified Prelude
import Prelude ( [](..), Integer )
g (x:xs) = xs
class A a where (+) :: a -> a -> a
instance A Integer where (+) = primPlusInteger
main = Prelude.putStr (Prelude.shows (1+1 :: Integer) "\n")
-----------------------------------------------------------
Trying various implementations, we see, for example:
Hugs says `[' is a wrong syntax in import.
Neither help []([],(:)), ()(..), ()(()).
So, it remains to program g as
cons = Prelude.:
g (x Prelude.: xs) = cons x $ cons x xs
Right?
ghc-4.06 Allows [](..), but does not understand primPlusInteger.
(+) = Prelude.Num.(+) reports wrong syntax.
And the very aim is to replace Num with other classes.
(+) = (+) is of course not the point. Besides, it causes
a strange `threads' and `deadlock' run-time report.
Thank you in advance for the advice.
------------------
Sergey Mechveliani
[EMAIL PROTECTED]
