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I work for MessageLabs [messagelabs.com] in Toronto, ON, Canada. I write spam filters, MTA software, high performance network software, string matching algorithms, and other cool stuff mostly in Perl and C.
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I work for MessageLabs [messagelabs.com] in Toronto, ON, Canada. I write spam filters, MTA software, high performance network software, string matching algorithms, and other cool stuff mostly in Perl and C.
Tuesday July 08, 2003
10:28 AM
Weirdest perl bug ever...
OK, probably not "ever", but definitely odd. Try and replicate this:
Sort subroutine didn't return a numeric value at
/path/to/Module.pm line 92
And line 92 is:
my @sorted = sort { $b->[2] <=> $a->[2] } @probs;
(i.e. it's part of what almost looks like a long-hand Schwartzian transform).
Nobody on #london.pm could replicate the error message, although admittedly we didn't try very long.
I got this error emailed to me automatically from our scanning system, which sends me an email when an exception occurs. I received 1 only, out of about a billion ore more emails processed.
My theory is this is just cosmic rays. But it's certainly most odd looking.
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Answer (Score:2)
That's because <=> returns undef when it encounters NaN.