From 729030f387a14a1f05486bbc0c2bb4064da5df07 Mon Sep 17 00:00:00 2001
From: zhangzhonglai <zhangzhonglai@gmail.com>
Date: Wed, 15 Jun 2022 14:54:57 +0800
Subject: [PATCH] fix: filter_map requires to return an Option

---
 src/async-rust/tokio/stream.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/async-rust/tokio/stream.md b/src/async-rust/tokio/stream.md
index 58b1773a..c7b07753 100644
--- a/src/async-rust/tokio/stream.md
+++ b/src/async-rust/tokio/stream.md
@@ -184,7 +184,7 @@ got = b"6"
 let messages = subscriber
     .into_stream()
     .filter_map(|msg| match msg {
-        Ok(msg) if msg.content.len() == 1 => msg.unwrap().content,
+        Ok(msg) if msg.content.len() == 1 => Some(msg.content),
         _ => None,
     })
     .take(3);