Add non regression test

Author: VincentLanglet

tests/PHPStan/Rules/Arrays/NonexistentOffsetInArrayDimFetchRuleTest.php

@@ -926,4 +926,16 @@ public function testBug3747(): void
 		$this->analyse([__DIR__ . '/data/bug-3747.php'], []);
 	}
 
+	public function testBug1061(): void
+	{
+		$this->reportPossiblyNonexistentConstantArrayOffset = true;
+
+		$this->analyse([__DIR__ . '/data/bug-1061.php'], [
+			[
+				"Offset 'one'|'two' might not exist on array{two: 1, three: 2}.",
+				14,
+			],
+		]);
+	}
+
 }

tests/PHPStan/Rules/Arrays/data/bug-1061.php

@@ -0,0 +1,15 @@
+<?php declare(strict_types = 1);
+
+namespace Bug1061;
+
+class A {
+	const KEYS = ["one", "two"];
+	const ARR = [
+		"two" => 1,
+		"three" => 2
+	];
+}
+
+foreach (A::KEYS as $key) {
+	echo A::ARR[$key];
+}