Update ExpressionResultTest.php

Author: staabm

tests/PHPStan/Analyser/ExpressionResultTest.php

@@ -103,6 +103,10 @@ public static function dataIsAlwaysTerminating(): array
 				'call_user_func(function() { exit(); });',
 				true,
 			],
+			[
+				'usort($arr, static function($a, $b):int { return $a <=> $b; });',
+				false,
+			],
 			[
 				'var_dump(1+exit());',
 				true,