bug symfony#59364 [ErrorHandler] Don't trigger "internal" deprecations for anonymous LazyClosure instances (nicolas-grekas)

This PR was merged into the 6.4 branch.

Discussion
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[ErrorHandler] Don't trigger "internal" deprecations for anonymous LazyClosure instances

| Q             | A
| ------------- | ---
| Branch?       | 6.4
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | no
| Issues        | -
| License       | MIT

Commits
-------

dcb856c [ErrorHandler] Don't trigger "internal" deprecations for anonymous LazyClosure instances

Author: nicolas-grekas

src/Symfony/Component/ErrorHandler/DebugClassLoader.php

@@ -20,6 +20,7 @@
 use PHPUnit\Framework\MockObject\MockObject;
 use Prophecy\Prophecy\ProphecySubjectInterface;
 use ProxyManager\Proxy\ProxyInterface;
+use Symfony\Component\DependencyInjection\Argument\LazyClosure;
 use Symfony\Component\ErrorHandler\Internal\TentativeTypes;
 use Symfony\Component\VarExporter\LazyObjectInterface;
 
@@ -259,6 +260,7 @@ public static function checkClasses(): bool
                     && !is_subclass_of($symbols[$i], LegacyProxy::class)
                     && !is_subclass_of($symbols[$i], MockInterface::class)
                     && !is_subclass_of($symbols[$i], IMock::class)
+                    && !(is_subclass_of($symbols[$i], LazyClosure::class) && str_contains($symbols[$i], "@anonymous\0"))
                 ) {
                     $loader->checkClass($symbols[$i]);
                 }