Readonly as class name
-----
<?php
class ReadOnly {}
-----
Syntax error, unexpected T_READONLY, expecting T_STRING from 2:7 to 2:14
array(
    0: Stmt_Block(
        stmts: array(
        )
    )
)
-----
<?php
class ReadOnly {}
-----
!!version=7.4
array(
    0: Stmt_Class(
        attrGroups: array(
        )
        flags: 0
        name: Identifier(
            name: ReadOnly
        )
        extends: null
        implements: array(
        )
        stmts: array(
        )
    )
)