From 94b07a91bcaad498c18729f187a739e8a86a451c Mon Sep 17 00:00:00 2001
From: "leonardo.yvens" <leoyvens@gmail.com>
Date: Sun, 15 Oct 2017 17:58:25 -0200
Subject: [PATCH] update unstable book and error example

---
 .../src/language-features/optin-builtin-traits.md             | 4 +---
 src/librustc_typeck/diagnostics.rs                            | 2 +-
 2 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/src/doc/unstable-book/src/language-features/optin-builtin-traits.md b/src/doc/unstable-book/src/language-features/optin-builtin-traits.md
index ee24dd87d90c..97b57c690fcc 100644
--- a/src/doc/unstable-book/src/language-features/optin-builtin-traits.md
+++ b/src/doc/unstable-book/src/language-features/optin-builtin-traits.md
@@ -24,9 +24,7 @@ Example:
 ```rust
 #![feature(optin_builtin_traits)]
 
-trait Valid {}
-
-impl Valid for .. {}
+auto trait Valid {}
 
 struct True;
 struct False;
diff --git a/src/librustc_typeck/diagnostics.rs b/src/librustc_typeck/diagnostics.rs
index 33a0c2c34a34..013eb9c8ed2d 100644
--- a/src/librustc_typeck/diagnostics.rs
+++ b/src/librustc_typeck/diagnostics.rs
@@ -1854,7 +1854,7 @@ unsafe impl !Clone for Foo { }
 
 This will compile:
 
-```
+```ignore (ignore auto_trait future compatibility warning)
 #![feature(optin_builtin_traits)]
 
 struct Foo;