code: private function printReturn(Stmt\ClassMethod $node, array $types)
      {
          $stmt = '';
          if (array_key_exists('return', $types) === false && $this->hasReturnStatement($node) === false) {
              $stmt .= ' -> void';
          } elseif (array_key_exists('return', $types) === true && empty($types['return']['type']['value']) === false) {
              $stmt .= ' -> '.$this->printType($types['return']);
          }
  
          return $stmt;
      }
docs: @param Stmt\ClassMethod $node
  @param array            $types
  
  @return string