Fatal error: class and trait define the same constant in the composition of child class in case constant in trait is equal to constant in child class

Description

The following code:

<?php
trait T {
    public const a = C2::b;
}
class C1 {
    use T;
    const b = 1;
}
class C2 extends C1  {
    use T;
    const b = 2;
}
echo C1::a;
echo C2::a;

Resulted in this output:

Fatal error: C1 and T define the same constant (a) in the composition of C2. However, the definition differs and is considered incompatible. Class was composed in /in/riAnX on line 9

But I expected this output instead:

22

It's not clear to me why this code is incorrect, but at the same time, the following works:

<?php
trait T {
    public const a = self::b;
}
class C1 {
    use T;
    const b = 1;
}
class C2 extends C1  {
    use T;
    const b = 2;
}
echo C1::a;
echo C2::a;

and outputs

11

PHP Version

8.2

Operating System

No response

未指定源文件或测试。首先运行提供的 PHP 8.2 reproducer，并比较使用 C2::b 的 trait 常量与 self::b 变体；跟踪 trait/类常量的组合过程，以确定预期规则。完成的标准是：第一个示例遵循预期的常量解析行为，不会产生错误的 fatal error，并且有回归覆盖。