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