std: Stabilize APIs for the 1.6 release

This commit is the standard API stabilization commit for the 1.6 release cycle.
The list of issues and APIs below have all been through their cycle-long FCP and
the libs team decisions are listed below

Stabilized APIs

* `Read::read_exact`
* `ErrorKind::UnexpectedEof` (renamed from `UnexpectedEOF`)
* libcore -- this was a bit of a nuanced stabilization, the crate itself is now
  marked as `#[stable]` and the methods appearing via traits for primitives like
  `char` and `str` are now also marked as stable. Note that the extension traits
  themeselves are marked as unstable as they're imported via the prelude. The
  `try!` macro was also moved from the standard library into libcore to have the
  same interface. Otherwise the functions all have copied stability from the
  standard library now.
* The `#![no_std]` attribute
* `fs::DirBuilder`
* `fs::DirBuilder::new`
* `fs::DirBuilder::recursive`
* `fs::DirBuilder::create`
* `os::unix::fs::DirBuilderExt`
* `os::unix::fs::DirBuilderExt::mode`
* `vec::Drain`
* `vec::Vec::drain`
* `string::Drain`
* `string::String::drain`
* `vec_deque::Drain`
* `vec_deque::VecDeque::drain`
* `collections::hash_map::Drain`
* `collections::hash_map::HashMap::drain`
* `collections::hash_set::Drain`
* `collections::hash_set::HashSet::drain`
* `collections::binary_heap::Drain`
* `collections::binary_heap::BinaryHeap::drain`
* `Vec::extend_from_slice` (renamed from `push_all`)
* `Mutex::get_mut`
* `Mutex::into_inner`
* `RwLock::get_mut`
* `RwLock::into_inner`
* `Iterator::min_by_key` (renamed from `min_by`)
* `Iterator::max_by_key` (renamed from `max_by`)

Deprecated APIs

* `ErrorKind::UnexpectedEOF` (renamed to `UnexpectedEof`)
* `OsString::from_bytes`
* `OsStr::to_cstring`
* `OsStr::to_bytes`
* `fs::walk_dir` and `fs::WalkDir`
* `path::Components::peek`
* `slice::bytes::MutableByteVector`
* `slice::bytes::copy_memory`
* `Vec::push_all` (renamed to `extend_from_slice`)
* `Duration::span`
* `IpAddr`
* `SocketAddr::ip`
* `Read::tee`
* `io::Tee`
* `Write::broadcast`
* `io::Broadcast`
* `Iterator::min_by` (renamed to `min_by_key`)
* `Iterator::max_by` (renamed to `max_by_key`)
* `net::lookup_addr`

New APIs (still unstable)

* `<[T]>::sort_by_key` (added to mirror `min_by_key`)

Closes #27585
Closes #27704
Closes #27707
Closes #27710
Closes #27711
Closes #27727
Closes #27740
Closes #27744
Closes #27799
Closes #27801
cc #27801 (doesn't close as `Chars` is still unstable)
Closes #28968

4 files changed, 8 insertions, 13 deletions

diff --git a/src/libsyntax/ext/quote.rs b/src/libsyntax/ext/quote.rs
index fc6cacb40f1..496f6a429a3 100644
--- a/src/libsyntax/ext/quote.rs
+++ b/src/libsyntax/ext/quote.rs
@@ -178,7 +178,7 @@ pub mod rt {
                     let mut v = vec![];
                     for (i, x) in self.iter().enumerate() {
                         if i > 0 {
-                            v.push_all(&$sep);
+                            v.extend_from_slice(&$sep);
                         }
                         v.extend(x.to_tokens(cx));
                     }
diff --git a/src/libsyntax/feature_gate.rs b/src/libsyntax/feature_gate.rs
index e00c3e3bea4..c456b7dc8b9 100644
--- a/src/libsyntax/feature_gate.rs
+++ b/src/libsyntax/feature_gate.rs
@@ -132,7 +132,7 @@ const KNOWN_FEATURES: &'static [(&'static str, &'static str, Option<u32>, Status
     ("unmarked_api", "1.0.0", None, Active),
 
     // Allows using #![no_std]
-    ("no_std", "1.0.0", Some(27701), Active),
+    ("no_std", "1.0.0", None, Accepted),
 
     // Allows using #![no_core]
     ("no_core", "1.3.0", Some(29639), Active),
@@ -286,8 +286,7 @@ pub const KNOWN_ATTRIBUTES: &'static [(&'static str, AttributeType, AttributeGat
     ("plugin", CrateLevel, Gated("plugin",
                                  "compiler plugins are experimental \
                                   and possibly buggy")),
-    ("no_std", CrateLevel, Gated("no_std",
-                                 "no_std is experimental")),
+    ("no_std", CrateLevel, Ungated),
     ("no_core", CrateLevel, Gated("no_core",
                                   "no_core is experimental")),
     ("lang", Normal, Gated("lang_items",
diff --git a/src/libsyntax/lib.rs b/src/libsyntax/lib.rs
index 9401999465b..4498120a78f 100644
--- a/src/libsyntax/lib.rs
+++ b/src/libsyntax/lib.rs
@@ -29,7 +29,6 @@
 #![cfg_attr(stage0, feature(rustc_attrs))]
 #![cfg_attr(stage0, allow(unused_attributes))]
 #![feature(associated_consts)]
-#![feature(drain)]
 #![feature(filling_drop)]
 #![feature(libc)]
 #![feature(rustc_private)]
@@ -37,7 +36,6 @@
 #![feature(str_char)]
 #![feature(str_escape)]
 #![feature(unicode)]
-#![feature(vec_push_all)]
 
 extern crate fmt_macros;
 extern crate serialize;
diff --git a/src/libsyntax/print/pprust.rs b/src/libsyntax/print/pprust.rs
index aa55cb847fa..f7105951296 100644
--- a/src/libsyntax/print/pprust.rs
+++ b/src/libsyntax/print/pprust.rs
@@ -120,17 +120,15 @@ pub fn print_crate<'a>(cm: &'a CodeMap,
         // However we don't want these attributes in the AST because
         // of the feature gate, so we fake them up here.
 
-        let no_std_meta = attr::mk_word_item(InternedString::new("no_std"));
+        // #![feature(prelude_import)]
         let prelude_import_meta = attr::mk_word_item(InternedString::new("prelude_import"));
-
-        // #![feature(no_std)]
-        let fake_attr = attr::mk_attr_inner(attr::mk_attr_id(),
-                                            attr::mk_list_item(InternedString::new("feature"),
-                                                               vec![no_std_meta.clone(),
-                                                                    prelude_import_meta]));
+        let list = attr::mk_list_item(InternedString::new("feature"),
+                                      vec![prelude_import_meta]);
+        let fake_attr = attr::mk_attr_inner(attr::mk_attr_id(), list);
         try!(s.print_attribute(&fake_attr));
 
         // #![no_std]
+        let no_std_meta = attr::mk_word_item(InternedString::new("no_std"));
         let fake_attr = attr::mk_attr_inner(attr::mk_attr_id(), no_std_meta);
         try!(s.print_attribute(&fake_attr));
     }