test

Author: staabm

tests/PHPStan/Rules/Methods/ReturnTypeRuleTest.php

@@ -1305,4 +1305,9 @@ public function testBug5946(): void
 		]);
 	}
 
+	public function testBug9669(): void
+	{
+		$this->analyse([__DIR__ . '/data/bug-9669.php'], []);
+	}
+
 }

tests/PHPStan/Rules/Methods/data/bug-9669.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace Bug9669;
+
+class HelloWorld
+{
+	/**
+	 * @param array<int, array{a: string}> $sets
+	 *
+	 * @return array<int, array{a: string, b: bool}>
+	 */
+	public function sayHello(array $sets): array
+	{
+		foreach ($sets as &$set) {
+			$set['b'] = false;
+		}
+
+		return $sets;
+	}
+}