Added regression test

Author: staabm

tests/PHPStan/Rules/DeadCode/UnusedPrivatePropertyRuleTest.php

@@ -315,4 +315,11 @@ public function testBug10628(): void
 		$this->analyse([__DIR__ . '/data/bug-10628.php'], []);
 	}
 
+	public function testBug8781(): void
+	{
+		$this->alwaysWrittenTags = [];
+		$this->alwaysReadTags = [];
+		$this->analyse([__DIR__ . '/data/bug-8781.php'], []);
+	}
+
 }

tests/PHPStan/Rules/DeadCode/data/bug-8781.php

@@ -0,0 +1,37 @@
+<?php
+
+namespace Bug8781;
+
+class ExecSync
+{
+	/**
+	 * @var array<mixed>
+	 */
+	private $stdOut;
+
+	/**
+	 * @var string
+	 */
+	private $command;
+
+	/**
+	 * @param string $command
+	 */
+	public function __construct($command)
+	{
+		$this->command = $command;
+	}
+
+	public function run(): void
+	{
+		exec($this->command, $this->stdOut);
+	}
+
+	/**
+	 * @return array<mixed>
+	 */
+	public function wait(): array
+	{
+		return $this->stdOut;
+	}
+}