Fix checking for missing stability annotations

Remove couple of unnecessary `#![feature(staged_api)]`.

Author: petrochenkov

src/liballoc/lib.rs

@@ -244,10 +244,10 @@ mod std {
 pub enum Bound<T> {
     /// An inclusive bound.
     #[stable(feature = "collections_bound", since = "1.17.0")]
-    Included(T),
+    Included(#[stable(feature = "collections_bound", since = "1.17.0")] T),
     /// An exclusive bound.
     #[stable(feature = "collections_bound", since = "1.17.0")]
-    Excluded(T),
+    Excluded(#[stable(feature = "collections_bound", since = "1.17.0")] T),
     /// An infinite endpoint. Indicates that there is no bound in this direction.
     #[stable(feature = "collections_bound", since = "1.17.0")]
     Unbounded,

src/librustc/middle/stability.rs

@@ -313,8 +313,9 @@ struct MissingStabilityAnnotations<'a, 'tcx: 'a> {
 impl<'a, 'tcx: 'a> MissingStabilityAnnotations<'a, 'tcx> {
     fn check_missing_stability(&self, id: NodeId, span: Span) {
         let def_id = self.tcx.hir.local_def_id(id);
+        let stab = self.tcx.stability.borrow().stab_map.get(&def_id).cloned();
         let is_error = !self.tcx.sess.opts.test &&
-                        !self.tcx.stability.borrow().stab_map.contains_key(&def_id) &&
+                        (stab == None || stab == Some(None)) &&
                         self.access_levels.is_reachable(id);
         if is_error {
             self.tcx.sess.span_err(span, "This node does not have a stability attribute");
@@ -420,7 +421,6 @@ impl<'a, 'tcx> Index<'tcx> {
         let is_staged_api =
             sess.opts.debugging_opts.force_unstable_if_unmarked ||
             sess.features.borrow().staged_api;
-
         let mut staged_api = FxHashMap();
         staged_api.insert(LOCAL_CRATE, is_staged_api);
         Index {

src/libterm/lib.rs

@@ -51,7 +51,6 @@
 #![deny(missing_docs)]
 #![deny(warnings)]
 
-#![feature(staged_api)]
 #![cfg_attr(windows, feature(libc))]
 // Handle rustfmt skips
 #![feature(custom_attribute)]

src/test/compile-fail-fulldeps/explore-issue-38412.rs

@@ -10,7 +10,6 @@
 
 // aux-build:pub_and_stability.rs
 
-#![feature(staged_api)]
 #![feature(unused_feature)]
 
 // A big point of this test is that we *declare* `unstable_declared`,

src/test/compile-fail/lint-forbid-cmdline.rs

@@ -10,7 +10,6 @@
 
 // compile-flags: -F deprecated
 
-#![feature(staged_api)]
 #[allow(deprecated)] //~ ERROR allow(deprecated) overruled by outer forbid(deprecated)
 fn main() {
 }

src/test/compile-fail/stability-attribute-issue-43027.rs

@@ -0,0 +1,20 @@
+// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+#![feature(staged_api)]
+#![stable(feature = "test", since = "0")]
+
+#[stable(feature = "test", since = "0")]
+pub struct Reverse<T>(pub T); //~ ERROR This node does not have a stability attribute
+
+fn main() {
+    // Make sure the field is used to fill the stability cache
+    Reverse(0).0;
+}