1--TEST-- 2Explicit nullable types do not imply a default value 3--FILE-- 4<?php 5 6function f(?callable $p) {} 7 8f(); 9?> 10--EXPECTF-- 11Fatal error: Uncaught ArgumentCountError: Too few arguments to function f(), 0 passed in %snullable_type_parameters_do_not_have_default_value.php on line %d and exactly 1 expected in %s:%d 12Stack trace: 13#%d %s 14#%d %s 15 thrown in %s on line %d 16