Fix return type patching for list and class-string pseudo types

Author: derrabus

DebugClassLoader.php

@@ -70,6 +70,8 @@ class DebugClassLoader
         'self' => 'self',
         'parent' => 'parent',
         'mixed' => 'mixed',
+        'list' => 'array',
+        'class-string' => 'string',
     ] + (\PHP_VERSION_ID >= 80000 ? [
         'static' => 'static',
         '$this' => 'static',