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Auto merge of #36609 - brson:relnotes, r=alexcrichton
Add changelog for 1.12 [Rendered](https://github.com/brson/rust/blob/relnotes/RELEASES.md).
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‎RELEASES.md

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Version 1.12.0 (2016-09-29)
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===========================
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Highlights
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----------
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* [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)]
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(https://github.com/rust-lang/rust/pull/34096).
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This translation pass is far simpler than the previous AST->LLVM pass, and
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creates opportunities to perform new optimizations directly on the MIR. It
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was previously described [on the Rust blog]
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(https://blog.rust-lang.org/2016/04/19/MIR.html).
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* [`rustc` presents a new, more readable error format, along with
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machine-readable JSON error output for use by IDEs]
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(https://github.com/rust-lang/rust/pull/35401).
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Most common editors supporting Rust have been updated to work with it. It was
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previously described [on the Rust blog]
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(https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
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Compiler
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--------
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* [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)]
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(https://github.com/rust-lang/rust/pull/34096).
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This translation pass is far simpler than the previous AST->LLVM pass, and
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creates opportunities to perform new optimizations directly on the MIR. It
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was previously described [on the Rust blog]
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(https://blog.rust-lang.org/2016/04/19/MIR.html).
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* [Print the Rust target name, not the LLVM target name, with
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`--print target-list`]
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(https://github.com/rust-lang/rust/pull/35489)
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* [The computation of `TypeId` is correct in some cases where it was previously
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producing inconsistent results]
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(https://github.com/rust-lang/rust/pull/35267)
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* [The `mips-unknown-linux-gnu` target uses hardware floating point by default]
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(https://github.com/rust-lang/rust/pull/34910)
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* [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
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`--print relocation-models`, and `--print code-models` print the available
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options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
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`-C code-model` code generation arguments]
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(https://github.com/rust-lang/rust/pull/34845)
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* [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
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`arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`]
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(https://github.com/rust-lang/rust/pull/35060).
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These targets produce statically-linked binaries. There are no binary release
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builds yet though.
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Diagnostics
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-----------
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* [`rustc` presents a new, more readable error format, along with
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machine-readable JSON error output for use by IDEs]
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(https://github.com/rust-lang/rust/pull/35401).
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Most common editors supporting Rust have been updated to work with it. It was
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previously described [on the Rust blog]
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(https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
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* [In error descriptions, references are now described in plain english,
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instead of as "&-ptr"]
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(https://github.com/rust-lang/rust/pull/35611)
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* [In error type descriptions, unknown numeric types are named `{integer}` or
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`{float}` instead of `_`]
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(https://github.com/rust-lang/rust/pull/35080)
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* [`rustc` emits a clearer error when inner attributes follow a doc comment]
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(https://github.com/rust-lang/rust/pull/34676)
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Language
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--------
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* [`macro_rules!` invocations can be made within `macro_rules!` invocations]
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(https://github.com/rust-lang/rust/pull/34925)
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* [`macro_rules!` meta-variables are hygienic]
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(https://github.com/rust-lang/rust/pull/35453)
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* [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
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useful]
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(https://github.com/rust-lang/rust/pull/34908)
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* [`macro_rules!` `stmt` matchers correctly consume the entire contents when
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inside non-braces invocations]
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(https://github.com/rust-lang/rust/pull/34886)
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* [Semicolons are properly required as statement delimeters inside
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`macro_rules!` invocations]
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(https://github.com/rust-lang/rust/pull/34660)
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* [`cfg_attr` works on `path` attributes]
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(https://github.com/rust-lang/rust/pull/34546)
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Stabilized APIs
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---------------
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* [`Cell::as_ptr`]
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(https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
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* [`RefCell::as_ptr`]
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(https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
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* [`IpAddr::is_unspecified`]
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(https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
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* [`IpAddr::is_loopback`]
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(https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
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* [`IpAddr::is_multicast`]
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(https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
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* [`Ipv4Addr::is_unspecified`]
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(https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
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* [`Ipv6Addr::octets`]
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(https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
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* [`LinkedList::contains`]
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(https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
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* [`VecDeque::contains`]
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(https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
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* [`ExitStatusExt::from_raw`]
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(https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
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Both on Unix and Windows.
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* [`Receiver::recv_timeout`]
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(https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
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* [`RecvTimeoutError`]
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(https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
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* [`BinaryHeap::peek_mut`]
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(https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
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* [`PeekMut`]
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(https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
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* [`iter::Product`]
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(https://doc.rust-lang.org/std/iter/trait.Product.html)
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* [`iter::Sum`]
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(https://doc.rust-lang.org/std/iter/trait.Sum.html)
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* [`OccupiedEntry::remove_entry`]
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(https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
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* [`VacantEntry::into_key`]
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(https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
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Libraries
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---------
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* [The `format!` macro and friends now allow a single argument to be formatted
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in multiple styles]
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(https://github.com/rust-lang/rust/pull/33642)
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* [The lifetime bounds on `[T]::binary_search_by` and
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`[T]::binary_search_by_key` have been adjusted to be more flexible]
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(https://github.com/rust-lang/rust/pull/34762)
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* [`Option` implements `From` for its contained type]
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(https://github.com/rust-lang/rust/pull/34828)
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* [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type]
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(https://github.com/rust-lang/rust/pull/35392)
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* [`RwLock` panics if the reader count overflows]
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(https://github.com/rust-lang/rust/pull/35378)
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* [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant]
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(https://github.com/rust-lang/rust/pull/35354)
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* [`vec::Drain` and `binary_heap::Drain` are covariant]
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(https://github.com/rust-lang/rust/pull/34951)
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* [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`]
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(https://github.com/rust-lang/rust/pull/35064)
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* [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`]
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(https://github.com/rust-lang/rust/pull/34946)
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* [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
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implement `Debug`]
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(https://github.com/rust-lang/rust/pull/34946)
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* [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
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implement `Debug`]
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(https://github.com/rust-lang/rust/pull/34885)
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* [`String` implements `AddAssign`]
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(https://github.com/rust-lang/rust/pull/34890)
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* [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
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`PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits]
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(https://github.com/rust-lang/rust/pull/34879)
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* [`FileType` implements `Debug`]
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(https://github.com/rust-lang/rust/pull/34757)
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* [References to `Mutex` and `RwLock` are unwind-safe]
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(https://github.com/rust-lang/rust/pull/34756)
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* [`mpsc::sync_channel` `Receiver`s return any available message before
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reporting a disconnect]
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(https://github.com/rust-lang/rust/pull/34731)
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* [Unicode definitions have been updated to 9.0]
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(https://github.com/rust-lang/rust/pull/34599)
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* [`env` iterators implement `DoubleEndedIterator`]
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(https://github.com/rust-lang/rust/pull/33312)
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Cargo
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-----
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* [Support local mirrors of registries]
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(https://github.com/rust-lang/cargo/pull/2857)
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* [Add support for command aliases]
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(https://github.com/rust-lang/cargo/pull/2679)
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* [Allow `opt-level="s"` / `opt-level="z"` in profile overrides]
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(https://github.com/rust-lang/cargo/pull/3007)
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* [Make `cargo doc --open --target` work as expected]
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(https://github.com/rust-lang/cargo/pull/2988)
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* [Speed up noop registry updates]
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(https://github.com/rust-lang/cargo/pull/2974)
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* [Update OpenSSL]
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(https://github.com/rust-lang/cargo/pull/2971)
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* [Fix `--panic=abort` with plugins]
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(https://github.com/rust-lang/cargo/pull/2954)
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* [Always pass `-C metadata` to the compiler]
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(https://github.com/rust-lang/cargo/pull/2946)
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* [Fix depending on git repos with workspaces]
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(https://github.com/rust-lang/cargo/pull/2938)
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* [Add a `--lib` flag to `cargo new`]
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(https://github.com/rust-lang/cargo/pull/2921)
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* [Add `http.cainfo` for custom certs]
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(https://github.com/rust-lang/cargo/pull/2917)
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* [Indicate the compilation profile after compiling]
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(https://github.com/rust-lang/cargo/pull/2909)
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* [Allow enabling features for dependencies with `--features`]
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(https://github.com/rust-lang/cargo/pull/2876)
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* [Add `--jobs` flag to `cargo package`]
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(https://github.com/rust-lang/cargo/pull/2867)
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* [Add `--dry-run` to `cargo publish`]
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(https://github.com/rust-lang/cargo/pull/2849)
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* [Add support for `RUSTDOCFLAGS`]
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(https://github.com/rust-lang/cargo/pull/2794)
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Performance
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-----------
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* [`panic::catch_unwind` is more optimized]
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(https://github.com/rust-lang/rust/pull/35444)
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* [`panic::catch_unwind` no longer accesses thread-local storage on entry]
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(https://github.com/rust-lang/rust/pull/34866)
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Tooling
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-------
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* [Test binaries now support a `--test-threads` argument to specify the number
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of threads used to run tests, and which acts the same as the
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`RUST_TEST_THREADS` environment variable]
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(https://github.com/rust-lang/rust/pull/35414)
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* [The test runner now emits a warning when tests run over 60 seconds]
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(https://github.com/rust-lang/rust/pull/35405)
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* [rustdoc: Fix methods in search results]
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(https://github.com/rust-lang/rust/pull/34752)
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* [`rust-lldb` warns about unsupported versions of LLDB]
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(https://github.com/rust-lang/rust/pull/34646)
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* [Rust releases now come with source packages that can be installed by rustup
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via `rustup component add rust-src`]
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(https://github.com/rust-lang/rust/pull/34366).
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The resulting source code can be used by tools and IDES, located in the
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sysroot under `lib/rustlib/src`.
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Misc
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----
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* [The compiler can now be built against LLVM 3.9]
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(https://github.com/rust-lang/rust/pull/35594)
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* Many minor improvements to the documentation.
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* [The Rust exception handling "personality" routine is now written in Rust]
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(https://github.com/rust-lang/rust/pull/34832)
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Compatibility Notes
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-------------------
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* [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
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with the lowercase format instead of the uppercase]
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(https://github.com/rust-lang/rust/pull/35084)
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* [When formatting strings, if "precision" is specified, the "fill",
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"align" and "width" specifiers are no longer ignored]
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(https://github.com/rust-lang/rust/pull/34544)
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* [The `Debug` impl for strings no longer escapes all non-ASCII characters]
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(https://github.com/rust-lang/rust/pull/34485)
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1257
Version 1.11.0 (2016-08-18)
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===========================
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