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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In reply to Re^2: my @ARGV by ysth
in thread Little annoying mistakes ... of others by szabgab

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