On 18/10/2012 11:07, Henning Thielemann wrote:

On Thu, 18 Oct 2012, Twan van Laarhoven wrote:

One piece of utility code that I find myself writing over and over
again is the pointwise Num instance for tuples, i.e.

For my taste, writing

   2 :: (Int, Integer)

   abs (x,y)

should yield a compiler error and the compiler should not try to
interpret it in some way. For the cases where you need these instances I
suggest you use custom data types.

Agreed, -1 from me.

Cheers,
        Simon



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