[Haskell-cafe] tuples and Show in GHC

hi all, Is there a principled reason why in GHC tuples with up to five elements automatically derive from the Show class but from six elements and up they don't anymore? If this is not a bug I would be very curious to hear what the reasoning behind this is.... below is an example of said behaviour :

type MyInt1 = (Int,Int,Int,Int,Int) myInt1 :: MyInt1 myInt1 = (1,2,3,4,5) type MyInt2 = (Int,Int,Int,Int,Int,Int) myInt2 :: MyInt2 myInt2 = (1,2,3,4,5,6)

.... *HS> myInt1 Loading package haskell98 ... linking ... done. (1,2,3,4,5) *HS> myInt2 <interactive>:1: No instance for (Show MyInt2) arising from use of `print' at <interactive>:1 In a 'do' expression: print it *HS> stijn.