Add regression test

Author: herndlm

tests/PHPStan/Rules/Properties/TypesAssignedToPropertiesRuleTest.php

@@ -139,6 +139,11 @@ public function testBug1216(): void
 		]);
 	}
 
+	public function testBug1311(): void
+	{
+		$this->analyse([__DIR__ . '/data/bug-1311.php'], []);
+	}
+
 	public function testTypesAssignedToPropertiesExpressionNames(): void
 	{
 		$this->analyse([__DIR__ . '/data/properties-from-array-into-object.php'], [

tests/PHPStan/Rules/Properties/data/bug-1311.php

@@ -0,0 +1,24 @@
+<?php declare(strict_types = 1);
+
+namespace Bug1311;
+
+class HelloWorld
+{
+	/**
+	 * @var array<int, string>
+	 */
+	private $list = [];
+
+	public function convertList(): void
+	{
+		$temp = [1, 2, 3];
+
+		for ($i = 0; $i < count($temp); $i++) {
+			$temp[$i] = (string) $temp[$i];
+		}
+
+		$this->list = $temp;
+	}
+}
+
+(new HelloWorld())->convertList();