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Language: enum implements interface — interface class constants E::X must resolve (zend_enum.c) #5725
Description
Category
language
Problem
Enums that implement an interface must inherit interface class constants and resolve E::X like Zend. VM today reports Undefined class constant; Zend returns the interface constant value.
#5719 covers trait use constants only, not implements I.
php-src reference
- php/php-src
Zend/zend_enum.c— enum implements interface - php/php-src
Zend/zend_interfaces.c— inherited constants
Repro
<?php
declare(strict_types=1);
interface I {
public const X = 1;
}
enum E implements I {
case A;
}
var_export(E::X);
echo "\n";./script/docker-exec.sh -- bash -lc 'source script/php-env.sh
php test/repro/parity_enum_interface_const.php
php bin/vm.php test/repro/parity_enum_interface_const.php 2>&1 | grep -v listSpreadRhs
'| Engine | Result |
|---|---|
| Zend | 1 |
| VM today | Undefined class constant E::X |
Scope (this repo)
| Area | Path |
|---|---|
| Compiler | enum implements — merge interface constants into enum class entry |
| VM | constant lookup E::X on enum with implemented interfaces |
PHP-in-PHP — no new runtime/*.c.
Done when
- Repro prints
1on VM - Compliance
.phptfor interface const on unit + backed enums -
./script/ci-fast.sh --filter parity_enum_interface_constgreen
Links
- Language: enum trait constants — E::X from trait use must resolve (zend_traits.c, zend_enum.c) #5719 — trait constants
- Language: enum case instanceof user interface — regression vs #3373 (zend_enum.c) #5703 — enum case
instanceofinterface - North star Epic: Self-host critical path — compiler compiles itself (M3→M5) #1492
Activity
PurHur commentedon Jun 4, 2026
claim: cursor-agent-lane-c — starting this run
Fix enum interface class constant inheritance (#5725) (#5746)
PurHur commentedon Jun 4, 2026
Merged via #5746.
Fix: After enum body materialization, VM calls
inheritFromInterfaces(); JIT registersclassImplementsand callsinheritInterfaceConstants()(same as classes).Verification:
test/repro/parity_enum_interface_const.php— Zend and VM both print1and'y'vendor/bin/phpunit --filter enum_interface_const— OK (1 test)Close #6407: wire enum const repro and interface const compliance. (#…