regression test for assign empty array to array of array of generic

Author: hrach

tests/PHPStan/Rules/Properties/data/properties-assigned-types.php

@@ -286,3 +286,16 @@ public function doBar($a)
 	}
 
 }
+
+/**
+ * @template T
+ */
+class Baz {
+	/** @var array{array<T>} */
+	private $var;
+
+	function test(): void
+	{
+		$this->var = [[]];
+	}
+}