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Add changelog for 1.12 #36609

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256 changes: 256 additions & 0 deletions RELEASES.md
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Version 1.12.0 (2016-09-29)
===========================

Highlights
----------

* [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)]
(https://github.com/rust-lang/rust/pull/34096).
This translation pass is far simpler than the previous AST->LLVM pass, and
creates opportunities to perform new optimizations directly on the MIR. It
was previously described [on the Rust blog]
(https://blog.rust-lang.org/2016/04/19/MIR.html).
* [`rustc` presents a new, more readable error format, along with
machine-readable JSON error output for use by IDEs]
(https://github.com/rust-lang/rust/pull/35401).
Most common editors supporting Rust have been updated to work with it. It was
previously described [on the Rust blog]
(https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).

Compiler
--------

* [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)]
(https://github.com/rust-lang/rust/pull/34096).
This translation pass is far simpler than the previous AST->LLVM pass, and
creates opportunities to perform new optimizations directly on the MIR. It
was previously described [on the Rust blog]
(https://blog.rust-lang.org/2016/04/19/MIR.html).
* [Print the Rust target name, not the LLVM target name, with
`--print target-list`]
(https://github.com/rust-lang/rust/pull/35489)
* [The computation of `TypeId` is correct in some cases where it was previously
producing inconsistent results]
(https://github.com/rust-lang/rust/pull/35267)
* [The `mips-unknown-linux-gnu` target uses hardware floating point by default]
(https://github.com/rust-lang/rust/pull/34910)
* [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
`--print relocation-models`, and `--print code-models` print the available
options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
`-C code-model` code generation arguments]
(https://github.com/rust-lang/rust/pull/34845)
* [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
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perhaps should mention that these targets produce statically linked binaries.

`arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`]
(https://github.com/rust-lang/rust/pull/35060).
These targets produce statically-linked binaries. There are no binary release
builds yet though.

Diagnostics
-----------

* [`rustc` presents a new, more readable error format, along with
machine-readable JSON error output for use by IDEs]
(https://github.com/rust-lang/rust/pull/35401).
Most common editors supporting Rust have been updated to work with it. It was
previously described [on the Rust blog]
(https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
* [In error descriptions, references are now described in plain english,
instead of as "&-ptr"]
(https://github.com/rust-lang/rust/pull/35611)
* [In error type descriptions, unknown numeric types are named `{integer}` or
`{float}` instead of `_`]
(https://github.com/rust-lang/rust/pull/35080)
* [`rustc` emits a clearer error when inner attributes follow a doc comment]
(https://github.com/rust-lang/rust/pull/34676)

Language
--------

* [`macro_rules!` invocations can be made within `macro_rules!` invocations]
(https://github.com/rust-lang/rust/pull/34925)
* [`macro_rules!` meta-variables are hygienic]
(https://github.com/rust-lang/rust/pull/35453)
* [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
useful]
(https://github.com/rust-lang/rust/pull/34908)
* [`macro_rules!` `stmt` matchers correctly consume the entire contents when
inside non-braces invocations]
(https://github.com/rust-lang/rust/pull/34886)
* [Semicolons are properly required as statement delimeters inside
`macro_rules!` invocations]
(https://github.com/rust-lang/rust/pull/34660)
* [`cfg_attr` works on `path` attributes]
(https://github.com/rust-lang/rust/pull/34546)

Stabilized APIs
---------------

* [`Cell::as_ptr`]
(https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
* [`RefCell::as_ptr`]
(https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
* [`IpAddr::is_unspecified`]
(https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
* [`IpAddr::is_loopback`]
(https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
* [`IpAddr::is_multicast`]
(https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
* [`Ipv4Addr::is_unspecified`]
(https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
* [`Ipv6Addr::octets`]
(https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
* [`LinkedList::contains`]
(https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
* [`VecDeque::contains`]
(https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
* [`ExitStatusExt::from_raw`]
(https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
Both on Unix and Windows.
* [`Receiver::recv_timeout`]
(https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
* [`RecvTimeoutError`]
(https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
* [`BinaryHeap::peek_mut`]
(https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
* [`PeekMut`]
(https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
* [`iter::Product`]
(https://doc.rust-lang.org/std/iter/trait.Product.html)
* [`iter::Sum`]
(https://doc.rust-lang.org/std/iter/trait.Sum.html)
* [`OccupiedEntry::remove_entry`]
(https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
* [`VacantEntry::into_key`]
(https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)

Libraries
---------

* [The `format!` macro and friends now allow a single argument to be formatted
in multiple styles]
(https://github.com/rust-lang/rust/pull/33642)
* [The lifetime bounds on `[T]::binary_search_by` and
`[T]::binary_search_by_key` have been adjusted to be more flexible]
(https://github.com/rust-lang/rust/pull/34762)
* [`Option` implements `From` for its contained type]
(https://github.com/rust-lang/rust/pull/34828)
* [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type]
(https://github.com/rust-lang/rust/pull/35392)
* [`RwLock` panics if the reader count overflows]
(https://github.com/rust-lang/rust/pull/35378)
* [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant]
(https://github.com/rust-lang/rust/pull/35354)
* [`vec::Drain` and `binary_heap::Drain` are covariant]
(https://github.com/rust-lang/rust/pull/34951)
* [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`]
(https://github.com/rust-lang/rust/pull/35064)
* [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`]
(https://github.com/rust-lang/rust/pull/34946)
* [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
implement `Debug`]
(https://github.com/rust-lang/rust/pull/34946)
* [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
implement `Debug`]
(https://github.com/rust-lang/rust/pull/34885)
* [`String` implements `AddAssign`]
(https://github.com/rust-lang/rust/pull/34890)
* [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
`PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits]
(https://github.com/rust-lang/rust/pull/34879)
* [`FileType` implements `Debug`]
(https://github.com/rust-lang/rust/pull/34757)
* [References to `Mutex` and `RwLock` are unwind-safe]
(https://github.com/rust-lang/rust/pull/34756)
* [`mpsc::sync_channel` `Receiver`s return any available message before
reporting a disconnect]
(https://github.com/rust-lang/rust/pull/34731)
* [Unicode definitions have been updated to 9.0]
(https://github.com/rust-lang/rust/pull/34599)
* [`env` iterators implement `DoubleEndedIterator`]
(https://github.com/rust-lang/rust/pull/33312)

Cargo
-----

* [Support local mirrors of registries]
(https://github.com/rust-lang/cargo/pull/2857)
* [Add support for command aliases]
(https://github.com/rust-lang/cargo/pull/2679)
* [Allow `opt-level="s"` / `opt-level="z"` in profile overrides]
(https://github.com/rust-lang/cargo/pull/3007)
* [Make `cargo doc --open --target` work as expected]
(https://github.com/rust-lang/cargo/pull/2988)
* [Speed up noop registry updates]
(https://github.com/rust-lang/cargo/pull/2974)
* [Update OpenSSL]
(https://github.com/rust-lang/cargo/pull/2971)
* [Fix `--panic=abort` with plugins]
(https://github.com/rust-lang/cargo/pull/2954)
* [Always pass `-C metadata` to the compiler]
(https://github.com/rust-lang/cargo/pull/2946)
* [Fix depending on git repos with workspaces]
(https://github.com/rust-lang/cargo/pull/2938)
* [Add a `--lib` flag to `cargo new`]
(https://github.com/rust-lang/cargo/pull/2921)
* [Add `http.cainfo` for custom certs]
(https://github.com/rust-lang/cargo/pull/2917)
* [Indicate the compilation profile after compiling]
(https://github.com/rust-lang/cargo/pull/2909)
* [Allow enabling features for dependencies with `--features`]
(https://github.com/rust-lang/cargo/pull/2876)
* [Add `--jobs` flag to `cargo package`]
(https://github.com/rust-lang/cargo/pull/2867)
* [Add `--dry-run` to `cargo publish`]
(https://github.com/rust-lang/cargo/pull/2849)
* [Add support for `RUSTDOCFLAGS`]
(https://github.com/rust-lang/cargo/pull/2794)

Performance
-----------

* [`panic::catch_unwind` is more optimized]
(https://github.com/rust-lang/rust/pull/35444)
* [`panic::catch_unwind` no longer accesses thread-local storage on entry]
(https://github.com/rust-lang/rust/pull/34866)

Tooling
-------

* [Test binaries now support a `--test-threads` argument to specify the number
of threads used to run tests, and which acts the same as the
`RUST_TEST_THREADS` environment variable]
(https://github.com/rust-lang/rust/pull/35414)
* [The test runner now emits a warning when tests run over 60 seconds]
(https://github.com/rust-lang/rust/pull/35405)
* [rustdoc: Fix methods in search results]
(https://github.com/rust-lang/rust/pull/34752)
* [`rust-lldb` warns about unsupported versions of LLDB]
(https://github.com/rust-lang/rust/pull/34646)
* [Rust releases now come with source packages that can be installed by rustup
via `rustup component add rust-src`]
(https://github.com/rust-lang/rust/pull/34366).
The resulting source code can be used by tools and IDES, located in the
sysroot under `lib/rustlib/src`.

Misc
----

* [The compiler can now be built against LLVM 3.9]
(https://github.com/rust-lang/rust/pull/35594)
* Many minor improvements to the documentation.
* [The Rust exception handling "personality" routine is now written in Rust]
(https://github.com/rust-lang/rust/pull/34832)

Compatibility Notes
-------------------

* [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
with the lowercase format instead of the uppercase]
(https://github.com/rust-lang/rust/pull/35084)
* [When formatting strings, if "precision" is specified, the "fill",
"align" and "width" specifiers are no longer ignored]
(https://github.com/rust-lang/rust/pull/34544)
* [The `Debug` impl for strings no longer escapes all non-ASCII characters]
(https://github.com/rust-lang/rust/pull/34485)


Version 1.11.0 (2016-08-18)
===========================

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