register_method_declaration

  Object->register_method_declaration (Object $metaclass, Str $name, Object $method)

This method required by the method declaration role will register the finished method object via the "$metaclass->add_method" method.

  MethodModifier->new(
      identifier           => 'around',
      modifier_type        => 'around',
      prototype_injections => {
          declarator => 'around',
          injections => [ 'CodeRef $orig' ],
      },
  );

This will mean that the signature "(Str $foo)" will become "CodeRef $orig: Object $self, Str $foo" and "()" will become "CodeRef $orig: Object $self".