public function testPassNoCollection() { $this->expectArgumentError('Functional\\false() expects parameter 1 to be array or instance of Traversable'); F\false('invalidCollection'); }
<?php use function Functional\true; use function Functional\select; use function Functional\reject; use function Functional\false; use Functional as F; reject([1, 2, 3], 'callback'); false([true, true, true]); $f = function () use($var) { };