1--TEST-- 2Explicit nullable types do not imply a default value 3--FILE-- 4<?php 5 6function f(?callable $p) {} 7 8f(); 9--EXPECTF-- 10Fatal 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 11Stack trace: 12#%d %s 13#%d %s 14 thrown in %s on line %d 15