Ignore PHPStan's ClassReflection::isEnum error when analyzing the extension code on PHP 7.4 (#324)

The error is unintentional and maybe it will be resolved soon, but until then let's ignore it.

It needs to be ignored only when running on PHP 7.4 and with PHPStan 2.x. The ignore would be reported as unmatched when running with `--prefer-lowest` (PHPStan 1.x), so that's why `reportUnmatched` is set to `false`.

See phpstan/phpstan#12888

Author: spaze

phpstan-ignore-errors.php

@@ -0,0 +1,18 @@
+<?php
+declare(strict_types = 1);
+
+$config = [
+	'parameters' => [
+		'ignoreErrors' => [],
+	]
+];
+
+if (PHP_VERSION_ID < 80000) {
+	// https://github.com/phpstan/phpstan/discussions/12888
+	$config['parameters']['ignoreErrors'][] = [
+		'message' => '#^Call to method PHPStan\\\\Reflection\\\\ClassReflection::isEnum\\(\\) will always evaluate to false\\.$#',
+		'reportUnmatched' => false,
+	];
+}
+
+return $config;

phpstan.neon

@@ -17,6 +17,7 @@ parameters:
 			- src/PHPStan1Compatibility.php
 
 includes:
+	- phpstan-ignore-errors.php
 	- vendor/phpstan/phpstan/conf/bleedingEdge.neon
 	- vendor/phpstan/phpstan-deprecation-rules/rules.neon
 	- extension.neon