[Haskell-beginners] Average of numeric list

[Tom Murphy]

>
> > I've always wondered, is it imaginable that a compiler would be able to
> > do such transforms (assuming very intelligent people (i.e. not me)
> > have plenty of time to work on it), or is it way too complicated ?
>
...

> Spotting more patterns would require more code in the compiler, and it
> would increase compile times.
>
> So one has to decide whether the cost is worth the benefit.
> Apparently, so far it has not been considered worthwhile.


It seems to me that, in almost every case, the cost of performance slow-down
is greater than the cost of compilation slow-down.

Tom
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