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Postings from September 2004
On Tue, Jun 08, 2004 at 08:38:52PM -0000, Michael G Schwern wrote:
> A co-worker exhausted his machine's memory trying to compile this:
>
> for ( '', 'a'..'zzzzzzz' ) {}
>
> B::Deparse (using 'zzz') reveals that Perl is trying to build that
> entire list in memory. The range optimizer seems to only kick in when
> there's nothing but a range in there.
>
> Our work around is:
>
> for ( $i = ""; $i ne "aaa"; ($i = $i ? ++$i : "a") ) { print $i }
>
> Bug/optimizer-miss appears in 5.6.1, 5.8.1 and 5.8.3.
I'm not sure how this can be construed as a bug. In the general
case I'd expect 'a'..'zzzzzzz' to generate a large list, since P5 doesn't
have P6's lazy lists. It just so happens that C<for (X..Y)> is
special-cased, but I don't see why that should lead to a general
expcatation of lazy-listness?
Dave.
--
Nothing ventured, nothing lost.
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