From 1b2e2c185516dc440279cd4672db40c36aa7385a Mon Sep 17 00:00:00 2001
From: "Kai Ma [TA]" <ksqsf@mail.ustc.edu.cn>
Date: Thu, 23 Sep 2021 20:29:26 +0800
Subject: [PATCH] [lab1] fix doc

---
 Documentations/1-parser/Basics.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Documentations/1-parser/Basics.md b/Documentations/1-parser/Basics.md
index 7b86914..91f9600 100644
--- a/Documentations/1-parser/Basics.md
+++ b/Documentations/1-parser/Basics.md
@@ -41,7 +41,6 @@
 我们将 Cminus-f 的所有规则分为五类。
 
 1. 字面量、关键字、运算符与标识符
-   - `id`
    - `type-specifier`
    - `relop`
    - `addop`
@@ -62,6 +61,7 @@
    - `return-stmt`
 4. 表达式
    - `expression`
+   - `simple-expression`
    - `var`
    - `additive-expression`
    - `term`
@@ -237,7 +237,7 @@ int yylex(void)
     switch (c) {
     case EOF: return YYEOF;
     case 'R': return REIMU;
-    default:  return 0;     // 返回无效 token 值，迫使 bison 报错
+    default:  return YYUNDEF;     // 报告 token 未定义，迫使 bison 报错
     }
 }
 
-- 
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