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# test.pl
while (my $line = <>) {
  chomp $line;
  print qq{$line\n}; # yes I know, pointless use of chomp
}

> perl test.pl < test.pl
# test.pl
...
  chomp $line;
  print qq{$line\n}; # yes I know, pointless use of chomp
}

while (my $item = pop @my_array) {
  # do stuff with $item
}