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  1. or download this
        push @INC, \&my_sub;
        sub my_sub {
        my ($coderef, $filename) = @_;    # $coderef is \&my_sub
        ...
        }
    
  2. or download this
        push @INC, [ \&my_sub, $x, $y, ... ];
        sub my_sub {
    ...
        my @parameters = @$arrayref[1..$#$arrayref];
        ...
        }
    
  3. or download this
        # In Foo.pm
        package Foo;
    ...
    
        # In the main program
        push @INC, new Foo(...);