Use the anonymous class in the trait-caching E2E fixture

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CbZPnVnRJDLbnqmtD3sYSy

Author: ondrejmirtes

e2e/trait-caching/data/TestClassUsingTrait.php

@@ -15,7 +15,7 @@ public function doBar()
 		return $this->doFoo();
 	}
 
-	public function doBaz(): void
+	public function doBaz(): \stdClass
 	{
 		$class = new class() {
 
@@ -29,6 +29,8 @@ public function doBar()
 				return $this->doFoo();
 			}
 		};
+
+		return $class->doBar();
 	}
 
 }