Added regression test

Author: staabm

tests/PHPStan/Analyser/Bug13813IntegrationTest.php

@@ -0,0 +1,53 @@
+<?php declare(strict_types = 1);
+
+namespace PHPStan\Analyser;
+
+use PHPStan\Testing\PHPStanTestCase;
+use PHPUnit\Framework\Attributes\CoversNothing;
+use function array_map;
+use function array_merge;
+use function array_unique;
+use function error_reporting;
+use const E_ALL;
+
+#[CoversNothing]
+class Bug13813IntegrationTest extends PHPStanTestCase
+{
+
+	public function testBug13813(): void
+	{
+		error_reporting(E_ALL);
+		$analyzerResult = $this->runAnalyse([
+			__DIR__ . '/data/bug-13813.php',
+			__DIR__ . '/Bug13813Rule.php',
+		]);
+		$this->assertCount(2, $analyzerResult->getAllPhpErrors());
+		$this->assertCount(2, $analyzerResult->getFilteredPhpErrors());
+	}
+
+	/**
+	 * @param string[] $files
+	 * @return Error[]
+	 */
+	private function runAnalyse(array $files): AnalyserResult
+	{
+		$files = array_map(fn (string $file): string => $this->getFileHelper()->normalizePath($file), $files);
+		/** @var Analyser $analyser */
+		$analyser = self::getContainer()->getByType(Analyser::class);
+
+		return $analyser->analyse($files);
+	}
+
+	public static function getAdditionalConfigFiles(): array
+	{
+		return array_unique(
+			array_merge(
+				parent::getAdditionalConfigFiles(),
+				[
+					__DIR__ . '/bug13813.neon',
+				],
+			),
+		);
+	}
+
+}

tests/PHPStan/Analyser/Bug13813Rule.php

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+<?php declare(strict_types = 1);
+
+namespace PHPStan\Analyser;
+
+use PhpParser\Node;
+use PhpParser\Node\Expr\Variable;
+use PHPStan\Rules\Rule;
+
+/**
+ * @implements Rule<Node\Expr\Variable>
+ */
+class Bug13813Rule implements Rule
+{
+
+	public function getNodeType(): string
+	{
+		return Variable::class;
+	}
+
+	public function processNode(Node $node, Scope $scope): array
+	{
+		for ($i = 0; $i < 100; $i++) {
+			echo $x; // force emit a PHP warning at runtime
+		}
+
+		return [];
+	}
+
+}

tests/PHPStan/Analyser/bug13813.neon

@@ -0,0 +1,2 @@
+rules:
+	- PHPStan\Analyser\Bug13813Rule

tests/PHPStan/Analyser/data/bug-13813.php

@@ -0,0 +1,7 @@
+<?php
+
+namespace Bug13813;
+
+function doFoo($x) {
+	echo $x;
+}