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    Use of uninitialized value in addition (+) at...
    
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    use strict; 
    use warnings; 
    ...
        }; 
        return *inner; 
    }
    
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    $ perl func_template2.pl
    $addpiece = 20
    ...
    $addpiece = 555
    Subroutine main::inner redefined at func_template2.pl line 15.
    result f2 = 565