In addition to what Keith said, it's also guarenteed that the trace is
evaluated as soon as the function is entered.
- Hal
On Tue, 2003-10-14 at 02:36, Ferenc Wagner wrote:
> Hal Daume III <[EMAIL PROTECTED]> writes:
>
> >> f1 :: Int -> Int
> >> f1 x
> >> | trace ("The initial value is " ++ show x) False = undefined
> >> | otherwise = f2 x
> >
> > In general, the 'trace ... False = undefined' thing is
> > quite useful
>
> How is it better than
>
> > f1 x = trace ("The initial value is " ++ show x) $ f2 x
>
> ?
>
> Feri.
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--
Hal Daume III | [EMAIL PROTECTED]
"Arrest this man, he talks in maths." | www.isi.edu/~hdaume
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