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Regression: NoDiscard built-in attribute class not registered on PHP_COMPILER_PROFILE=8.4 (re-#13159, Zend/zend_attributes.c) #16826
Description
Category
stdlib · php-src-strict · regression (re-#13159)
Problem
PHP 8.4+ registers a built-in NoDiscard attribute class for #[\NoDiscard] on functions. On PHP_COMPILER_PROFILE=8.4, the attribute parses and applies, but class_exists('NoDiscard') and attribute_exists('NoDiscard', …) are false.
| Repro | Zend 8.4 | VM (2026-07-06, profile=8.4) |
|---|---|---|
class_exists('NoDiscard') |
true |
false |
attribute_exists('NoDiscard', stdClass::class) |
false |
false |
#[NoDiscard] function f(): int { return 1; } |
runs | runs (1) |
php-src reference
- php/php-src
Zend/zend_attributes.stub.php—NoDiscardattribute (PHP 8.4+) - php/php-src
Zend/zend_attributes.c— registration
PHP implementation target
ext/standard/built-in attribute registration alongside other Zend attributes — PHP inext/, shrink duplicate C registration if present
Repro
./script/docker-exec.sh -- bash -lc 'export PHP_COMPILER_PROFILE=8.4; php bin/vm.php test/repro/maintainer_gap_nodiscard_attribute_class.php'Done when
-
class_exists('NoDiscard')true onPHP_COMPILER_PROFILE=8.4(false on 8.2 reference) -
ReflectionFunction::getAttributes()returnsNoDiscardwhen applied - Compliance
.phptguard undertest/compliance/cases/language/ - php-src-strict; no php-compiler-strict shortcut
Activity
PurHur commentedon Jul 6, 2026
claim: cursor-agent-lane-c — starting this run
Language: register NoDiscard builtin attribute on PHP_COMPILER_PROFIL…
PurHur commentedon Jul 6, 2026
Merged via #16831.
Fix:
advertisesNoDiscardAttributeClass()now useslanguageProfileVersion()(same asadvertisesOverrideAttributeClass()), soPHP_COMPILER_PROFILE=8.4registers the builtinNoDiscardclass while the default8.4.0-devreference profile keeps the phantom gate.Verified:
PHP_COMPILER_PROFILE=8.4→class_exists('NoDiscard')true,#[NoDiscard] function f()runsmaintainer_gap_nodiscard_registration.phpprintsokNoDiscardBuiltinAttributeTest,BuiltinAttributePhantomTest,nodiscard_class_exists.phpt(VM, profile 8.4)