From cad4a3b3b8fb1a86680340c52fa4aed49dd304f4 Mon Sep 17 00:00:00 2001
From: Unisko PENG <unisko@gmail.com>
Date: Fri, 7 Apr 2023 16:57:43 +0800
Subject: [PATCH] Update Ch21

---
 src/Ch21_Appendix.md | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/Ch21_Appendix.md b/src/Ch21_Appendix.md
index 4ad22db..17d47f4 100644
--- a/src/Ch21_Appendix.md
+++ b/src/Ch21_Appendix.md
@@ -199,4 +199,8 @@ fn main() {
 | `br"..."`, `br#"..."`, `br##"..."##` 等等 | 原始字节字符串字面值，是原始与字节字符串字面值的结合 |
 | `'...'` | 字符字面值 |
 | `b'...'` | ASCII 字节字面值 |
+| <code>&vert;...&vert; expr</code> | 闭包 |
+| `!` | 发散函数下总是空的底部类型，always empty bottom type for diverging functions |
+| `_` | “忽略，ignored” 模式绑定；还用于令到整数字面值可读，also used to make integer literals readable |
+