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    has 'successor' => (
    is => 'rw',
    isa => 'ChainOfResposibilityIf',
);
  2. or download this
    has 'successor' => (
    is => 'rw',
    does => 'ChainOfResposibilityIf', # !!!
);
  3. or download this
    use Moose::Util::TypeConstraints qw(role_type);
has 'successor' => (
    is => 'rw',
    isa => role_type('ChainOfResposibilityIf'),
);