[TypeInfo] Prevent interfaces extending BackedEnum to be treated as BackedEnums

Author: ettoredn

src/Symfony/Component/TypeInfo/Tests/Fixtures/DummyBackedEnumInterface.php

@@ -0,0 +1,16 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\TypeInfo\Tests\Fixtures;
+
+interface DummyBackedEnumInterface extends \BackedEnum
+{
+}

src/Symfony/Component/TypeInfo/Tests/Fixtures/ReflectionExtractableDummy.php

@@ -37,6 +37,8 @@ final class ReflectionExtractableDummy extends AbstractDummy
     public DummyBackedEnum $backedEnum;
     public ?DummyBackedEnum $nullableBackedEnum;
 
+    public DummyBackedEnumInterface $backedEnumInterface;
+
     public int|string $union;
     public \Traversable&\Stringable $intersection;
 

src/Symfony/Component/TypeInfo/Tests/TypeResolver/ReflectionTypeResolverTest.php

@@ -17,6 +17,7 @@
 use Symfony\Component\TypeInfo\Tests\Fixtures\AbstractDummy;
 use Symfony\Component\TypeInfo\Tests\Fixtures\Dummy;
 use Symfony\Component\TypeInfo\Tests\Fixtures\DummyBackedEnum;
+use Symfony\Component\TypeInfo\Tests\Fixtures\DummyBackedEnumInterface;
 use Symfony\Component\TypeInfo\Tests\Fixtures\DummyEnum;
 use Symfony\Component\TypeInfo\Tests\Fixtures\ReflectionExtractableDummy;
 use Symfony\Component\TypeInfo\Type;
@@ -67,6 +68,7 @@ public static function resolveDataProvider(): iterable
         yield [Type::nullable(Type::enum(DummyEnum::class)), $reflection->getProperty('nullableEnum')->getType()];
         yield [Type::enum(DummyBackedEnum::class), $reflection->getProperty('backedEnum')->getType()];
         yield [Type::nullable(Type::enum(DummyBackedEnum::class)), $reflection->getProperty('nullableBackedEnum')->getType()];
+        yield [Type::object(DummyBackedEnumInterface::class), $reflection->getProperty('backedEnumInterface')->getType()];
         yield [Type::union(Type::int(), Type::string()), $reflection->getProperty('union')->getType()];
         yield [Type::intersection(Type::object(\Traversable::class), Type::object(\Stringable::class)), $reflection->getProperty('intersection')->getType()];
     }

src/Symfony/Component/TypeInfo/TypeResolver/ReflectionTypeResolver.php

@@ -76,7 +76,7 @@ public function resolve(mixed $subject, ?TypeContext $typeContext = null): Type
             default => $identifier,
         };
 
-        if (is_subclass_of($className, \UnitEnum::class)) {
+        if (is_subclass_of($className, \UnitEnum::class) && !interface_exists($className)) {
             $type = Type::enum($className);
         } else {
             $type = Type::object($className);