Create bug-12574b.php

Author: staabm

tests/PHPStan/Rules/Arrays/data/bug-12574b.php

@@ -0,0 +1,15 @@
+<?php declare(strict_types = 1);
+
+namespace Bug12574b;
+
+class HelloWorld
+{
+	public function sayHello2(string $a): void
+	{
+		$b = [];
+
+		$b[$a] = 'abc';
+
+		echo $b[$a];
+	}
+}