From 94a194884a68dee7b0bbbdd9049e48f8e746a2ae Mon Sep 17 00:00:00 2001
From: Carl Fredrik Samson <cf@samson.no>
Date: Sun, 6 Dec 2020 01:49:29 +0100
Subject: [PATCH] optin_builtin_traits is now called auto_traits

---
 src/4_pin.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/4_pin.md b/src/4_pin.md
index 8ed3ee1..183a647 100644
--- a/src/4_pin.md
+++ b/src/4_pin.md
@@ -611,7 +611,7 @@ But now, let's prevent this problem using `Pin`. I've commented along the way to
 make it easier to spot and understand the changes we need to make.
 
 ```rust
-#![feature(optin_builtin_traits, negative_impls)] // needed to implement `!Unpin`
+#![feature(auto_traits, negative_impls)] // needed to implement `!Unpin`
 use std::pin::Pin;
 
 pub fn main() {