setAlternate example

$node = $this->createNode("IfStatement", $token);
                $node->setTest($test);
                $node->setConsequent($consequent);
                
                if ($this->scanner->consume("else")) {
                    if (($alternate = $this->parseStatement()) ||
                        (!$this->scanner->getStrictMode() &&
                        $alternate = $this->parseFunctionOrGeneratorDeclaration(
                            false, false
                        ))
                    ) {
                        $node->setAlternate($alternate);
                        return $this->completeNode($node);
                    }
                } else {
                    return $this->completeNode($node);
                }
            }
            
            $this->error();
        }
        return null;
    }