Class String Const cannot be set as Backed Enum Case

[enobrev]

Description

The following code:

<?php
    class A {
        final public const VALUE = 'something';
    }

    enum B: string {
        case C = A::VALUE;
    }

    var_dump(B::C);

Resulted in this output:

PHP Fatal error:  Enum case value must be compile-time evaluatable in /.../enum_const_string.php on line 7

But I expected this output instead:

enum(B::C)

PHP Version

PHP 8.1.4

Operating System

No response

[bwoebi]

This is not a bug, but intentionally left out (for implementation reasons) in the RFC: https://wiki.php.net/rfc/enumerations#constant-reference_expression_values

If you have a good implementation, feel free to create a PR. For now I'm going to close this issue.

[iluuu1994]

It's being worked on here:
#8190