Re: putStr

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 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. _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe -- Hal Daume III | hdaume@isi.edu "Arrest this man, he talks in maths." | www.isi.edu/~hdaume