相对稳定版本

includes/ast/__init__.vp

@@ -48,7 +48,7 @@ from .match import (
     MatchCase, MatchValue, MatchSingleton, MatchSequence,
     MatchMapping, MatchClass, MatchStar, MatchAs, MatchOr,
 )
-from .visitor import ASTVisitor
+# from .visitor import ASTVisitor
 from .lexer import Lexer, _lexer_init, tokenize, new_lexer
 from .parser import Parser, _parser_init, parse_tokens, new_parser
 from .parser import _parse_test