From 1cc54d03270740d797c498cd29536565602dc2dd Mon Sep 17 00:00:00 2001
From: Oliver Middleton <olliemail27@gmail.com>
Date: Tue, 21 Jun 2016 23:30:15 +0100
Subject: [PATCH] Mark concat_idents! unstable

This is mostly just a documentation fix as I don't think stability
attributes have any effect on macros.
---
 src/libstd/macros.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/libstd/macros.rs b/src/libstd/macros.rs
index d69789cedaf..26cf8a3199d 100644
--- a/src/libstd/macros.rs
+++ b/src/libstd/macros.rs
@@ -276,7 +276,7 @@ macro_rules! option_env { ($name:expr) => ({ /* compiler built-in */ }) }
     /// // fn concat_idents!(new, fun, name) { } // not usable in this way!
     /// # }
     /// ```
-    #[stable(feature = "rust1", since = "1.0.0")]
+    #[unstable(feature = "concat_idents", issue = "29599")]
     #[macro_export]
     macro_rules! concat_idents {
         ($($e:ident),*) => ({ /* compiler built-in */ })
-- 
2.44.0