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  1. or download this
    package MyFirst; 
    use strict; use warnings; use feature 'say';
    ...
    }
    
    1;
    
  2. or download this
    package MySecond; 
    use strict; use warnings; use feature 'say';
    ...
    }
    
    1;
    
  3. or download this
    use strict; use warnings; use feature 'say';
    
    ...
    MySecond::do_that();
    
    __END__
    
  4. or download this
    perl 1203778.pl
    
    Hello from MyFirst
    Hello from MySecond
    This is a warning!
    
  5. or download this
    $ cat logfile 
    
    This is a debug message
    This is a warning!