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  1. or download this
    $i++ and warn;
  2. or download this
    $i++ and printf "this is line %s\n", __LINE__;
# or..
$i++ and print "this is line ". __LINE__ . "\n";
  3. or download this
    $i++ and line();

sub line { printf STDERR "now executing line %s\n", (caller)[2] }