<?php
namespace {
    class ReflectionClass implements Reflector {
        /** @psalm-pure */
        public function isReadOnly(): bool {}
    }

    /** @psalm-immutable */
    class ReflectionUnionType extends ReflectionType {
        /** @return non-empty-list<ReflectionNamedType|ReflectionIntersectionType> */
        public function getTypes(): array {}
    }
}