To do this we need to define (!) prefix, thus
   (!) arr i = ....
rather than infix

rolling back:

Fri Nov 12 21:09:02 GMT Standard Time 2010  Ian Lynagh <igloo@earth.li>
  * Remove bang patterns from Data.Array.Base
  GHC now refuses to accept top-level bang patterns unless BangPAtterns is
  enabled, which we can't use in Data.Array.Base due to the way ! is used
  as an operator.

    M ./Data/Array/Base.hs -15 +21

GHC now refuses to accept top-level bang patterns unless BangPAtterns is
enabled, which we can't use in Data.Array.Base due to the way ! is used
as an operator.

It is now in its own diffarray package

As well as checking that offset we are reading is actually inside the
array, we now also check that it is "in range" as defined by the Ix
instance. This fixes confusing behaviour (#2120) and improves some error
messages (#2669).

These instances aren't orphans; they'll be available if Foldable or
Traversable are.  They shouldn't be here because then they'd leak the
instances in Control.Monad.Instances into the Haskell 98 module Array.

Now that orphan warnings obey -Werror, we must suppress them when
they occur.

I'd prefer that these three modules didn't have orphans; Ian is going
to look into this.

These are no longer needed, now that Prelude is in a different package