From 70db73a33011794622e22f10fbc0c6b2cae4292c Mon Sep 17 00:00:00 2001
From: Falco Hirschenberger <falco.hirschenberger@gmail.com>
Date: Mon, 18 May 2015 16:37:05 +0200
Subject: [PATCH] Show the span of feature that is unstable when using a
 feature-list.

---
 src/librustc_lint/builtin.rs | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/librustc_lint/builtin.rs b/src/librustc_lint/builtin.rs
index 8d555240e70..adce0c145b7 100644
--- a/src/librustc_lint/builtin.rs
+++ b/src/librustc_lint/builtin.rs
@@ -2203,7 +2203,11 @@ impl LintPass for UnstableFeatures {
     }
     fn check_attribute(&mut self, ctx: &Context, attr: &ast::Attribute) {
         if attr::contains_name(&[attr.node.value.clone()], "feature") {
-            ctx.span_lint(UNSTABLE_FEATURES, attr.span, "unstable feature");
+            if let Some(items) = attr.node.value.meta_item_list() {
+                for item in items {
+                    ctx.span_lint(UNSTABLE_FEATURES, item.span, "unstable feature");
+                }
+            }
         }
     }
 }