Skip check for negatable input options on symfony/console < 5.3

Related: #300

Author: eliashaeussler

phpstan-baseline.neon

@@ -1,5 +1,10 @@
 parameters:
 	ignoreErrors:
+		-
+			message: "#^Call to function method_exists\\(\\) with Symfony\\\\Component\\\\Console\\\\Input\\\\InputOption and 'isNegatable' will always evaluate to true\\.$#"
+			count: 1
+			path: src/Type/Symfony/GetOptionTypeHelper.php
+
 		-
 			message: "#^Accessing PHPStan\\\\Rules\\\\Methods\\\\CallMethodsRule\\:\\:class is not covered by backward compatibility promise\\. The class might change in a minor PHPStan version\\.$#"
 			count: 1

src/Type/Symfony/GetOptionTypeHelper.php

@@ -12,14 +12,15 @@
 use PHPStan\Type\TypeCombinator;
 use PHPStan\Type\UnionType;
 use Symfony\Component\Console\Input\InputOption;
+use function method_exists;
 
 class GetOptionTypeHelper
 {
 
 	public function getOptionType(Scope $scope, InputOption $option): Type
 	{
 		if (!$option->acceptValue()) {
-			if ($option->isNegatable()) {
+			if (method_exists($option, 'isNegatable') && $option->isNegatable()) {
 				return new UnionType([new BooleanType(), new NullType()]);
 			}