original_string: public function mustBeInstanceOf(string $instanceOf) : Slot
      {
          $this->instanceOf = class_exists($instanceOf) || interface_exists($instanceOf) ? $instanceOf : self::INSTANCE_OF_ANY;
          return $this;
      }
code: public function mustBeInstanceOf(string $instanceOf) : Slot
      {
          $this->instanceOf = class_exists($instanceOf) || interface_exists($instanceOf) ? $instanceOf : self::INSTANCE_OF_ANY;
          return $this;
      }
code_tokens: public function mustBeInstanceOf ( string $ instanceOf ) : Slot { $ this -> instanceOf = class_exists ( $ instanceOf ) || interface_exists ( $ instanceOf ) ? $ instanceOf : self :: INSTANCE_OF_ANY ; return $ this ; }
docstring: Set instance-of restriction
  
  @param string $instanceOf
  
  @return Slot
docstring_tokens: Set instance - of restriction