my $_ is new with 5.10.0, and switches anything in the scope that by default is using the global $_ to using the lexical $_ instead.
my @ARGV has no such magic. readline or eof will continue to default to using the global @ARGV, even though there's a lexical @ARGV in scope. This is the reason for a warning.
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Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
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<blockquote> <br /> <dd>
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<code> tags not
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