[Hugs-users] Avoiding use of the stack

[Josef Svenningsson]

> -----Original Message-----
> From: ajb at spamcop.net
> Sent: den 20 november 2004 14:19
> To: hugs-users at haskell.org
> Subject: RE: [Hugs-users] Avoiding use of the stack
> 
> G'day all.
> 
> Quoting Josef Svenningsson <josefs at cs.chalmers.se>:
> 
> > In what sense is it wrong, and in what sense does this example show
> that?
> 
> The time that you want to use $! is when you want some argument to some
> function to be strict.  Unfortunately, $! and $ have different
> associativities to normal function application, requiring you to introduce
> readability-imparing parentheses if the strict argument is not the last
> one:
> 
>         testR2' a n = (testR2' $! (a+n)) (n-1)
> 
> If $! and $ were both left-associative, you could write this instead:
> 
>         testR2' a n = testR2' $! (a+n) $ (n-1)
> 
Ah, you're quite right of course. This surely must be a bug in the report.

Cheers,

	/Josef