Add non-regression test for varTag.type rule with generic @var tag

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: phpstan-bot

tests/PHPStan/Rules/PhpDoc/VarTagChangedExpressionTypeRuleTest.php

@@ -79,6 +79,11 @@ public function testBug10130(): void
 		]);
 	}
 
+	public function testBug14429(): void
+	{
+		$this->analyse([__DIR__ . '/data/bug-14429-var-tag.php'], []);
+	}
+
 	public function testBug12708(): void
 	{
 		$this->analyse([__DIR__ . '/data/bug-12708.php'], [

tests/PHPStan/Rules/PhpDoc/data/bug-14429-var-tag.php

@@ -0,0 +1,29 @@
+<?php
+
+declare(strict_types = 1);
+
+namespace Bug14429VarTag;
+
+/** @template E of IEntity */
+class ICollection {}
+
+class IEntity {
+	/** @return ICollection<IEntity> */
+	public function getCollection(): ICollection { return new ICollection(); }
+}
+
+/**
+ * @template E of IEntity
+ */
+class OneHasOne
+{
+	/**
+	 * @return ICollection<E>
+	 */
+	protected function createCollection(IEntity $e): ICollection
+	{
+		/** @var ICollection<E> $collection */
+		$collection = $e->getCollection();
+		return $collection;
+	}
+}