From 435c09e7ac4e0f29537b651e89eb90b61784d94c Mon Sep 17 00:00:00 2001
From: vitalyr <vitalyankh@gmail.com>
Date: Wed, 5 Aug 2020 00:09:02 +0800
Subject: [PATCH] add missing code in the tutorial: `use
 alloc::string::String;`

---
 docs/src/ch01-01-kernel-object.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/docs/src/ch01-01-kernel-object.md b/docs/src/ch01-01-kernel-object.md
index d7dc10b..ee06cf0 100644
--- a/docs/src/ch01-01-kernel-object.md
+++ b/docs/src/ch01-01-kernel-object.md
@@ -113,6 +113,7 @@ Rust 是一门部分面向对象的语言，我们通常用它的 trait 实现
 首先创建一个 `KernelObject` trait 作为内核对象的公共接口：
 
 ```rust,noplaypen
+use alloc::string::String;
 // src/object/mod.rs
 /// 内核对象公共接口
 pub trait KernelObject: Send + Sync {