Show and Integral

[Serge D. Mechveliani]

Sorry, I have forgotten to copy to the List my last note on this subject.

The on-line spec of Haskell-2010 shows

                  Eq     Show
                    \   /
                     Num
                      |
                     Real
                      |
                     Integral

Hence, for   x :: Integral a => a,   it is correct to apply  (show x).
And  ghc-7.4.0.20111219  does not allow this  (show x).
So, it breaks the standard, and people say, this is deliberate.
I witness such a break for the first time, and this looks so strange!
Well, I also diskile the edge  Show 
                              /
                            Num
    
in the standard. But it is better to implement Show as dummy for appropriate
types, -- so far, -- and to wait for the next standard.
Am I missing something?

Regards,

------
Sergei
mechvel at botik.ru