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  1. or download this
    >> cat exp/t_inject.pl
    use lib '../lib';
    ...
    warn "+1 line";
    warn "+2 line";
    warn "$x $y";
    
  2. or download this
    $ perl t_inject.pl 
    IMPORT(Filter::Inject 0 42) at ../lib/Filter/Inject.pm line 46.
    ...
    +1 line at t_inject.pl line 7.
    +2 line at t_inject.pl line 8.
    42 0 at t_inject.pl line 9.
    
  3. or download this
    >> cat lib/Filter/Inject.pm
    package Filter::Inject;
    ...
    =cut
    
    1;                # End of Filter::Inject