Examples: Added correct type-info to the create_ast example

examples/advanced/create_ast.py

@@ -15,6 +15,7 @@ from typing import List
 from dataclasses import dataclass
 
 from lark import Lark, ast_utils, Transformer, v_args
+from lark.tree import Meta
 
 this_module = sys.modules[__name__]
 
@@ -32,7 +33,8 @@ class _Statement(_Ast):
 
 @dataclass
 class Value(_Ast, ast_utils.WithMeta):
-    meta: object
+    "Uses WithMeta to include line-number metadata in the meta attribute"
+    meta: Meta
     value: object
 
 @dataclass