From f62aca2a777d4636e7dc7e4b82d4aa854435dcaf Mon Sep 17 00:00:00 2001
From: 0xmingx <wangrm3@126.com>
Date: Tue, 11 Oct 2022 22:49:43 +0800
Subject: [PATCH] fix bug

the `msg` type here is `Message`, don't need `unwrap()`, then wrapping `msg.content` in `Some`, return to fit the `filter_map`'s trait bound: Option<T>
---
 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);