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```
use mro;

...

   return undef;
}
```

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use strict;
use warnings;
...
print(find_implementor('Bar', 'm2' ) // "[undef]", "\n");  # Foo
print(find_implementor('Bar', 'a'  ) // "[undef]", "\n");  # [undef]
print(find_implementor('Bar', 'isa') // "[undef]", "\n");  # UNIVERSAL