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```
package child1;

...

1;
```
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```
package child2;

...

1;
```

use strict;
use Carp;
...
    croak ("couldn't invoke method #method on $class with params ($@)"
+)
  }

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~/src/perl/poly$ perl main.pl child1 polyexample 1 2
polyexample (child1) called with [1] and [2]

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~/src/perl/poly$ perl main.pl child2 polyexample 1 2
polyexample (child2) called with [1] and [2]

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~/src/perl/poly$ perl main.pl child5 polyexample 1 2
Couldn't find package child5 (Can't locate child5.pm in @INC (@INC con
+tains: /etc/perl /usr/local/lib/perl/5.10.0 /usr/local/share/perl/5.1
+0.0 /usr/lib/perl5 /usr/share/perl5 /usr/lib/perl/5.10 /usr/share/per
+l/5.10 /usr/local/lib/site_perl .) at (eval 1) line 2.
BEGIN failed--compilation aborted at (eval 1) line 2.