Added regression test

Author: staabm

tests/PHPStan/Rules/Arrays/DeadForeachRuleTest.php

@@ -45,4 +45,9 @@ public function testBug13248(): void
 		$this->analyse([__DIR__ . '/data/bug-13248.php'], []);
 	}
 
+	public function testBug2560(): void
+	{
+		$this->analyse([__DIR__ . '/data/bug-2560.php'], []);
+	}
+
 }

tests/PHPStan/Rules/Arrays/data/bug-2560.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace Bug2560;
+
+class HelloWorld
+{
+	public function test(): void
+	{
+		$arr = [];
+		foreach ([0,1] as $i) {
+			$arr[$i] = [];
+			array_push($arr[$i], "foo");
+		}
+		foreach (array_values($arr) as $vec) {
+			foreach ($vec as $value) {
+				print_r("$value");
+			}
+		}
+	}
+}