[DowngradePhp81] Handle ArrowFunction in DowngradeNeverTypeDeclarationRector - #397
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…nRector A "never" return type on an arrow function is invalid below PHP 8.1, yet the rule only subscribed to Function_, ClassMethod and Closure, so fn(): never => ... was left untouched. Add ArrowFunction to the subscribed node types; the decorator already accepts it. Assisted-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
samsonasik
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Thank you @roxblnfk |
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test(output): restore the never-returning arrow-fn helpers The downgrade path now carries Rector rules for both `ReflectionMethod::hasPrototype()` and `fn(): never => throw ...` (rectorphp/rector-downgrade-php#397, #398), so these hand-written 8.1 workarounds are redundant and the source returns to its plain 8.2 form. The memory_reset_peak_usage() guard and the memory-comparison skip stay — no Rector rule covers those. Assisted-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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🔍 What was changed
DowngradeNeverTypeDeclarationRectornow also strips theneverreturn type from arrow functions, not justFunction_,ClassMethodandClosure.Why?
A
neverreturn type is invalid on an arrow function below PHP 8.1 — semantically an arrow function always "returns" its expression. When downgrading e.g.fn (): never => throw ...from 8.2, the rule left theneverin place, producing code that does not parse on the target version. The decorator (PhpDocFromTypeDeclarationDecorator) already acceptedArrowFunction, so only the subscribed node types needed the addition.Checklist
Added
Fixture/arrow_function_never.php.inc; the rule's test suite passes (7/7). PHPStan and ECS pass on the changed rule.