PHP 8.1 - TypeError Cannot assign stdClass to reference held by property ...

[pjsde]

PHP 8.1 - TypeError Cannot assign stdClass to reference held by property ...

[JPustkuchen]

@jnvsor WHAO, you're Speedy Gonzales! Fastest mouse in Mexico 🚀
(No idea if that cartoon has the same name anywhere in the world, like in Germany xD)

Yes, perfect! Working just fine, thanks for the lightning fast fix!

[jnvsor]

Should be fixed in 055630e

[JPustkuchen]

Thanks @jnvsor,

we're using 5.0.6 and the issue still appears. I guess it should be fixed in this version?
For us it happens in Drupal 10.

The partial backtrace is:

TypeError: Cannot assign stdClass to reference held by property Symfony\Component\HttpFoundation\Session\Flash\FlashBag::$flashes of type array in Kint\Parser\Parser->parseArray() (line 377 of /vendor/kint-php/kint/src/Parser/Parser.php).

Kint\Parser\Parser->parse() (Line: 565)
Kint\Parser\Parser->parseObject() (Line: 138)
Kint\Parser\Parser->parse() (Line: 565)
Kint\Parser\Parser->parseObject() (Line: 138)
Kint\Parser\Parser->parse() (Line: 565)
Kint\Parser\Parser->parseObject() (Line: 138)
Kint\Parser\Parser->parse() (Line: 565)
Kint\Parser\Parser->parseObject() (Line: 138)
Kint\Parser\Parser->parse() (Line: 285)
Kint\Kint->dumpVar() (Line: 268)
Kint\Kint->dumpAll() (Line: 575)
Kint\Kint::dump() (Line: 64)
Drupal\devel\Plugin\Devel\Dumper\Kint->export() (Line: 105)
Drupal\devel\DevelDumperManager->export() (Line: 115)
Drupal\devel\DevelDumperManager->message() (Line: 183)
Drupal\devel\Twig\Extension\Debug->message() (Line: 44)
__TwigTemplate_1bb3a20a3f4847fc1af463271334acbf->doDisplay() (Line: 394)
Twig\Template->displayWithErrorHandling() (Line: 367)
Twig\Template->display() (Line: 379)
Twig\Template->render() (Line: 40)
Twig\TemplateWrapper->render() (Line: 53)
twig_render_template() (Line: 372)

Does that help?

Seems like it appeared with the Drupal 10 Upgrade which uses Symfony 6.2. With Drupal 9 we never had that issue before. Should this be reopened?

[jnvsor]

While it seems obvious, you can't assign a value to a reference of a typed property of the wrong type. Since copying arrays and assigning instances to each member was how we detected references all I had to do was throw a try catch around it to stop it failing on every object with a typed property.

I didn't realize someone could throw a reference to a typed property into an array and pass that into kint (Even though that's basically what kint is doing itself...) so we basically had to do the same thing for arrays too.

Please confirm that this works @JPustkuchen

---

Example code

<?php

class test {
    public int $v;
}

$t = new test();
$t->v = 4;

$a['val'] = &$t->v;

$a['val'] = 'test';