From 629c2a840c8334ca626df467e0d1e8ff8ef2c378 Mon Sep 17 00:00:00 2001
From: Vadim Petrochenkov <vadim.petrochenkov@gmail.com>
Date: Mon, 19 Oct 2015 01:52:08 +0300
Subject: [PATCH] Generate stability attributes for derived impls

The attributes are copied from the item for which the trait impl is derived
---
 src/libsyntax/ext/deriving/generic/mod.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/libsyntax/ext/deriving/generic/mod.rs b/src/libsyntax/ext/deriving/generic/mod.rs
index 2a5c4993112a..11bf6ec24ce9 100644
--- a/src/libsyntax/ext/deriving/generic/mod.rs
+++ b/src/libsyntax/ext/deriving/generic/mod.rs
@@ -417,7 +417,7 @@ impl<'a> TraitDef<'a> {
                 let mut attrs = newitem.attrs.clone();
                 attrs.extend(item.attrs.iter().filter(|a| {
                     match &a.name()[..] {
-                        "allow" | "warn" | "deny" | "forbid" => true,
+                        "allow" | "warn" | "deny" | "forbid" | "stable" | "unstable" => true,
                         _ => false,
                     }
                 }).cloned());