Because there isn't just one SUPER: perl needs to know what class you want the superclass of. If you tell it, perl will be happy:

  $foo1->bang();
  $foo2->bang();
  { package BAZ; $foo3->SUPER::bang(); }
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This is needed because you may have another class:

  package QUUX;
  use base qw/ BAR /;
  sub bang { shift->SUPER::bang }
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Hugo