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  1. or download this
    use Modern::Perl;
print "Hello World 1\n";
...
        die "open failed: " . $!;
print "Hello World 2";
warn ref $sub_ref;
  2. or download this
    Hello World 1
CODE at CodeTest.pl line 8.
  3. or download this
    Hello World 1
Hello World 2 - this is really bad at CodeTest.pl line 3
CODE at CodeTest.pl line 8.