Update ExpressionResultTest.php

Author: staabm

tests/PHPStan/Analyser/ExpressionResultTest.php

@@ -105,6 +105,10 @@ public static function dataIsAlwaysTerminating(): array
 				'(function() { exit(); })();',
 				true,
 			],
+			[
+				'function () {};',
+				false,
+			],
 			[
 				'call_user_func(function() { exit(); });',
 				true,