[DeadCode] Support multiple templates in RemoveUselessVarTagRector (#6402)

Author: dragosprotung

rules-tests/DeadCode/Rector/Property/RemoveUselessVarTagRector/Fixture/skip_template_tag_with_multiple_templates.php.inc

@@ -0,0 +1,18 @@
+<?php
+
+namespace Rector\Tests\DeadCode\Rector\Property\RemoveUselessVarTagRector\Fixture;
+
+use Rector\Tests\DeadCode\Rector\Property\RemoveUselessVarTagRector\Source\Properties;
+
+/**
+ * @template TProperties of Properties|null
+ * @template TCategories of object
+ */
+final class SkipTemplateTagWithMultipleTemplates
+{
+    /** @var TCategories */
+    private object $categories;
+
+    /** @var TProperties */
+    private Properties|null $properties;
+}

rules/TypeDeclaration/PHPStan/ObjectTypeSpecifier.php

@@ -11,7 +11,6 @@
 use PhpParser\Node\Stmt\Use_;
 use PhpParser\Node\Stmt\UseUse;
 use PHPStan\Analyser\Scope;
-use PHPStan\PhpDoc\Tag\TemplateTag;
 use PHPStan\Reflection\ClassReflection;
 use PHPStan\Reflection\ReflectionProvider;
 use PHPStan\Type\Generic\GenericObjectType;
@@ -85,14 +84,13 @@ public function narrowToFullyQualifiedOrAliasedObjectType(
                     return new NonExistingObjectType($className);
                 }
 
-                // only support single @template for now
-                if (count($templateTags) !== 1) {
+                $currentTemplateTag = $templateTags[$className] ?? null;
+
+                if ($currentTemplateTag === null) {
                     // invalid type
                     return new NonExistingObjectType($className);
                 }
 
-                /** @var TemplateTag $currentTemplateTag */
-                $currentTemplateTag = current($templateTags);
                 return TemplateTypeFactory::create(
                     $templateTypeScope,
                     $currentTemplateTag->getName(),