From 1046241be6fe85b0bc460e4d26535924db6875ea Mon Sep 17 00:00:00 2001
From: Rustln <rustln@outlook.com>
Date: Mon, 21 Mar 2022 17:33:27 +0800
Subject: [PATCH] Add `#[macro_export]` to custom marco

---
 src/advance/into-types/enum-int.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/advance/into-types/enum-int.md b/src/advance/into-types/enum-int.md
index f9e924a8..a6641664 100644
--- a/src/advance/into-types/enum-int.md
+++ b/src/advance/into-types/enum-int.md
@@ -139,6 +139,7 @@ fn main() {
 但是上面的代码有个问题，你需要为每个枚举成员都实现一个转换分支，非常麻烦。好在可以使用宏来简化，自动根据枚举的定义来实现`TryFrom`特征:
 
 ```rust
+#[macro_export]
 macro_rules! back_to_enum {
     ($(#[$meta:meta])* $vis:vis enum $name:ident {
         $($(#[$vmeta:meta])* $vname:ident $(= $val:expr)?,)*