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Fix code generation for never return type #735

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Fixes #729

Based upon #731 to execute pipeline on PHP 8.1.
I've fixed the deprecations raised by implementing \Serializable without the new __serialize/__unserialize methods, but I needed to disable deprecation report on lazy-loading-value-holder-internal-php-classes.phpt due to #[\ReturnTypeWillChange]-related errors.

@Ocramius Ocramius self-requested a review February 22, 2022 00:28
@Ocramius Ocramius added this to the 2.14.0 milestone Feb 22, 2022
@Ocramius Ocramius self-assigned this Feb 22, 2022
Comment on lines +1530 to +1532
if (PHP_VERSION_ID < 80100) {
self::markTestSkipped('Needs PHP 8.1');
}

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Can be replace by annotation:

/** @requires PHP >= 8.1 */

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Similar checks have been used in other tests, but yes could be replaced easily if needed.

@Ocramius Ocramius modified the milestones: 2.14.0, 2.15.0 Feb 28, 2022
@Ocramius Ocramius changed the base branch from 2.14.x to 2.15.x February 28, 2022 13:59

if ($originalMethod->returnsReference()) {
if ($originalReturnType instanceof ReflectionNamedType && $originalReturnType->getName() === 'never') {
$method->setBody('throw new \Exception();');
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Is this really needed? without anything in the body, php already throws:
TypeError: [...]: never-returning function must not implicitly return

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Mh, probably is not needed. Don't rembember why I added it honestly, I'll remove that

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Verify code generation for the new never type
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