===description===
byrefVarSetsPossible
===file===
<?php
                    /**
                     * @param mixed $a
                     * @psalm-param-out int $a
                     */
                    function takesByRef(&$a) : void {
                        $a = 5;
                    }

                    if (rand(0, 1)) {
                        takesByRef($b);
                    }

                    echo $b;
===expect===
PossiblyUndefinedGlobalVariable
===ignore===
TODO
