From 5480f7e67b33257fb80a4e1cf2d4f97ed63f2792 Mon Sep 17 00:00:00 2001
From: Unisko PENG <unisko@gmail.com>
Date: Tue, 4 Apr 2023 16:07:04 +0800
Subject: [PATCH] Update Ch20

---
 hello/src/lib.rs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/hello/src/lib.rs b/hello/src/lib.rs
index beca15f..fbcd7d0 100644
--- a/hello/src/lib.rs
+++ b/hello/src/lib.rs
@@ -1,4 +1,6 @@
 #![allow(warnings)]
+use std::thread;
+
 pub struct ThreadPool {
     threads: Vec<thread::JoinHandle<()>>,
 }