===description===
readonlyPropertyAssignOperator
===file===
<?php
                    class Test {
                        /** @readonly */
                        public int $prop;

                        public function __construct(int $prop) {
                            // Legal initialization.
                            $this->prop = $prop;
                        }
                    }

                    $test = new Test(5);

                    $test->prop += 1;
===expect===
InaccessibleProperty
===ignore===
TODO
