Auto merge of #30187 - alexcrichton:stabilize-1.6, r=aturon

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.
* `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

3 files changed, 1 insertions, 7 deletions

diff --git a/src/doc/book/custom-allocators.md b/src/doc/book/custom-allocators.md
index 6b19abc728c..65626c11462 100644
--- a/src/doc/book/custom-allocators.md
+++ b/src/doc/book/custom-allocators.md
@@ -83,7 +83,6 @@ annotated version of `alloc_system`
 // Allocators are not allowed to depend on the standard library which in turn
 // requires an allocator in order to avoid circular dependencies. This crate,
 // however, can use all of libcore.
-#![feature(no_std)]
 #![no_std]
 
 // Let's give a unique name to our custom allocator
diff --git a/src/doc/book/lang-items.md b/src/doc/book/lang-items.md
index 76b9f82827b..e492bd3e782 100644
--- a/src/doc/book/lang-items.md
+++ b/src/doc/book/lang-items.md
@@ -16,7 +16,7 @@ and one for deallocation. A freestanding program that uses the `Box`
 sugar for dynamic allocations via `malloc` and `free`:
 
 ```rust
-#![feature(lang_items, box_syntax, start, no_std, libc)]
+#![feature(lang_items, box_syntax, start, libc)]
 #![no_std]
 
 extern crate libc;
diff --git a/src/doc/book/no-stdlib.md b/src/doc/book/no-stdlib.md
index 0040878fb2f..3a4d4c306dc 100644
--- a/src/doc/book/no-stdlib.md
+++ b/src/doc/book/no-stdlib.md
@@ -16,7 +16,6 @@ in the same format as C:
 # #![feature(libc)]
 #![feature(lang_items)]
 #![feature(start)]
-#![feature(no_std)]
 #![no_std]
 
 // Pull in the system libc library for what crt0.o likely requires
@@ -46,7 +45,6 @@ compiler's name mangling too:
 
 ```rust
 # #![feature(libc)]
-#![feature(no_std)]
 #![feature(lang_items)]
 #![feature(start)]
 #![no_std]
@@ -104,9 +102,6 @@ vectors provided from C, using idiomatic Rust practices.
 # #![feature(libc)]
 #![feature(lang_items)]
 #![feature(start)]
-#![feature(no_std)]
-#![feature(core)]
-#![feature(core_slice_ext)]
 #![feature(raw)]
 #![no_std]