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Update RELEASES.md for 1.2
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‎RELEASES.md

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Version 1.2.0 (August 2015)
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===========================
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* ~1200 changes, numerous bugfixes
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Highlights
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----------
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* [Parallel codegen][parcodegen] is now working again, which can substantially
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speed up large builds in debug mode; It also gets another ~33% speedup when
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bootstrapping on a 4 core machine (using 8 jobs). It's not enabled by default,
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but will be "in the near future"
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* [Dynamically-sized-type coercions][dst] allow smart pointer types
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like `Rc` to contain types without a fixed size, arrays and trait
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objects, finally enabling use of `Rc<[T]>` and completing the
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implementation of DST.
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* [Parallel codegen][parcodegen] is now working again, which can
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substantially speed up large builds in debug mode; It also gets
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another ~33% speedup when bootstrapping on a 4 core machine (using 8
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jobs). It's not enabled by default, but will be "in the near
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future". It can be activated with the `-C codegen-units=N` flag to
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`rustc`.
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Breaking Changes
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----------------
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* The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
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unicode case mapping, which is a previously-planned change in
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behavior and considered a bugfix.
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* [`mem::align_of`] now specifies [the *minimum alignment* for
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T][align], which is usually the alignment programs are interested
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in, and the same value reported by clang's
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`alignof`. [`mem::min_align_of`] is deprecated. This is not known to
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break real code.
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Language
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--------
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* Patterns with `ref mut` now correctly invoke [`DerefMut`] when
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matching against dereferencable values.
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Libraries
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---------
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* The [`Extend`] trait, which grows a collection from an iterator, is
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implemented over iterators of references, for `String`, `Vec`,
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`LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
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`BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
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* The [`iter::once`] function returns an iterator that yields a single
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element.
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* The [`iter::empty`] function returns an iterator that yields no
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elements.
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* The [`matches`] and [`rmatches`] methods on `str` return iterators
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over substring matches.
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* [`Cell`] and [`RefCell`] both implement [`Eq`].
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* A number of methods for wrapping arithmetic are added to the
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integral types, [`wrapping_div`], [`wrapping_rem`],
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[`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
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addition to the existing [`wrapping_add`], [`wrapping_sub`], and
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[`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
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type.. It is illegal for the default arithmetic operations in Rust
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to overflow; the desire to wrap must be explicit.
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* The `{:#?}` formatting specifier [displays the alternate,
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pretty-printed][debugfmt] form of the `Debug` formatter. This
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feature was actually introduced prior to 1.0 with little
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fanfare.
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* [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
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for writing data to formatted strings, similar to [`io::Write`].
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* [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
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[`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
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are used by code generators to emit implementations of [`Debug`].
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* `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
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methods that convert case, following Unicode case mapping.
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* It is now easier to handle to poisoned locks. The [`PoisonError`]
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type, returned by failing lock operations, exposes `into_inner`,
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`get_ref`, and `get_mut`, which all give access to the inner lock
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guard, and allow the poisoned lock to continue to operate. The
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`is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
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poisoned lock without attempting to take the lock.
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* On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
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[`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
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On Windows the `FromRawHandle` trait is implemented for `Stdio`,
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and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
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`ChildStderr`.
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* [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
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malformed input.
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Misc
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----
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* `rustc` employs smarter heuristics for guessing at [typos].
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* `rustc` emits more efficient code for [no-op conversions between
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unsafe pointers][nop].
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* Fat pointers are now [passed in pairs of immediate arguments][fat],
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resulting in faster compile times and smaller code.
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[`Extend`]: http://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
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[extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
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[`iter::once`]: http://doc.rust-lang.org/nightly/std/iter/fn.once.html
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[`iter::empty`]: http://doc.rust-lang.org/nightly/std/iter/fn.empty.html
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[`matches`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
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[`rmatches`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
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[`Cell`]: http://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
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[`RefCell`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
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[`wrapping_add`]: http://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
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[`wrapping_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
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[`wrapping_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
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[`wrapping_div`]: http://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
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[`wrapping_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
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[`wrapping_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
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[`wrapping_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
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[`wrapping_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
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[`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
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[`fmt::Formatter`]: http://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
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[`fmt::Write`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
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[`io::Write`]: http://doc.rust-lang.org/nightly/std/io/trait.Write.html
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[`debug_struct`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
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[`debug_tuple`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
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[`debug_list`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
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[`debug_set`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
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[`debug_map`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
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[`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
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[strup]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
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[strlow]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
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[`to_uppercase`]: http://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
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[`to_lowercase`]: http://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
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[`PoisonError`]: http://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
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[`RwLock`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
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[`Mutex`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
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[`FromRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
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[`AsRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
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[`Stdio`]: http://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
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[`ChildStdin`]: http://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
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[`ChildStdout`]: http://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
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[`ChildStderr`]: http://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
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[`io::ErrorKind`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
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[debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
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[`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
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[`mem::align_of`]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
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[align]: https://github.com/rust-lang/rust/pull/25646
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[`mem::min_align_of`]: http://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
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[typos]: https://github.com/rust-lang/rust/pull/26087
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[nop]: https://github.com/rust-lang/rust/pull/26336
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[fat]: https://github.com/rust-lang/rust/pull/26411
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[dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
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[parcodegen]: https://github.com/rust-lang/rust/pull/26018
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