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Re: Looking For The Obvious - Debugging Perl

by Abigail-II (Bishop)
on Jun 22, 2004 at 10:58 UTC ( #368668=note: print w/replies, xml ) Need Help??


in reply to Looking For The Obvious - Debugging Perl

{Story about faulty cards}
It was a powerful lesson
Except for the "look at the obvious" lesson, I think there's an even more useful lesson in this story: listen to the advice of others.

Abigail

  • Comment on Re: Looking For The Obvious - Debugging Perl

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Re^2: Looking For The Obvious - Debugging Perl
by greenFox (Vicar) on Jun 23, 2004 at 01:45 UTC

    "Except for the "look at the obvious" lesson, I think there's an even more useful lesson in this story: listen to the advice of others."

    Laughing. I think I was only 19 or so at the time, I like to think I have learned that one as well *grin*

    --
    Do not seek to follow in the footsteps of the wise. Seek what they sought. -Basho

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[hippo]: Ah
[Corion]: But maybe there is some other Unicode string that will be true but have a zero width
[hippo]: For explanation, I've seen this construct in someone else's code (no names, no pack drill) and couldn't think of a situation to trigger it.
[Corion]: You'll have to look somewhere esoteric for that. Maybe some tied variable or special dualvar can also trigger that. But it's certainly not a common occurrence
[Corion]: And on 5.20, the following also outputs no find:perl -wle 'for my $x ("\x{2000}".."\ x{1fffff}") { if( $x && ! length $x ) { warn qq(<$x>); warn length $x; die } }'
[Corion]: (this time on Unix)
[hippo]: Understood. I'll have to go through the code and see if it's doing anything fancy with ties, dual-vars or non-scalars. In the end, it's probably a bug though.

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