===description===
callableMissingOptionalThisArray
===file===
<?php
                    /**
                     * @param callable(string=):bool $arg
                     * @return void
                     */
                    function foo($arg) {}

                    class A {
                        public function __construct() {
                            foo([$this, "bar"]);
                        }

                        public function bar(): bool {
                            return true;
                        }
                    }
===expect===
PossiblyInvalidArgument
===ignore===
TODO
