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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!