in reply to Warning gets the line number wrong?

You haven't shown the entire statement that begins on line 416, presuming it's that "if".

Keep in mind that a statement (including a chain of elsifs) is all considered to begin on its first line, no matter how many lines it spans. So you probably have a <= comparison in some elsif branch that you aren't showing, and one side of that is undef, just as the error says.

-- Randal L. Schwartz, Perl hacker

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Re^2: Warning gets the line number wrong?
by Cap'n Steve (Friar) on Apr 30, 2007 at 20:43 UTC
    Wow, I never even knew that. I'm sure there's a reason for that and the undef problem mentioned earlier, but that's incredibly annoying.
[reply]
      Yes, it's annoying, but once you are aware of it (and get used to it), it's not so tough. Here's a simple demo of the basic pattern: 
      #!/usr/bin/perl -w

$_ = undef;
if ( 1 == 2 ) {  # this is line 4
  print "This cannot happen\n";
}
elsif ( $_ < 3 ) {  # the problem is at line 7
  print "This works okay (but throws a warning)\n";
}

      [download]
      You'll see that the warning message cites line 4. Simple rule: when a warning points to an "if" statement and makes no sense for that line, check each of the "elsif" statements that relate to that line.
[reply]
[d/l]

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