Rust 1.9.0

Language

--------

* The #[deprecated] attribute when applied to an API will generate

warnings when used. The warnings may be suppressed with

#[allow(deprecated)]. [RFC 1270].

* [fn item types are zero sized, and each fn names a unique

type][1.9fn]. This will break code that transmutes fns, so calling

transmute on a fn type will generate a warning for a few cycles,

then will be converted to an error.

* [Field and method resolution understand visibility, so private

fields and methods cannot prevent the proper use of public fields

and methods][1.9fv].

* [The parser considers unicode codepoints in the

PATTERN_WHITE_SPACE category to be whitespace][1.9ws].

Stabilized APIs

---------------

* [std::panic]

* [std::panic::catch_unwind] (renamed from recover)

* [std::panic::resume_unwind] (renamed from propagate)

* [std::panic::AssertUnwindSafe] (renamed from AssertRecoverSafe)

* [std::panic::UnwindSafe] (renamed from RecoverSafe)

* [str::is_char_boundary]

[<const T>::as_ref] [<mut T>::as_ref] [<mut T>::as_mut]

* [AsciiExt::make_ascii_uppercase]

* [AsciiExt::make_ascii_lowercase]

* [char::decode_utf16]

* [char::DecodeUtf16]

* [char::DecodeUtf16Error]

* [char::DecodeUtf16Error::unpaired_surrogate]

* [BTreeSet::take]

* [BTreeSet::replace]

* [BTreeSet::get]

* [HashSet::take]

* [HashSet::replace]

* [HashSet::get]

* [OsString::with_capacity]

* [OsString::clear]

* [OsString::capacity]

* [OsString::reserve]

* [OsString::reserve_exact]

* [OsStr::is_empty]

* [OsStr::len]

* [std::os::unix::thread]

* [RawPthread]

* [JoinHandleExt]

* [JoinHandleExt::as_pthread_t]

* [JoinHandleExt::into_pthread_t]

* [HashSet::hasher]

* [HashMap::hasher]

* [CommandExt::exec]

* [File::try_clone]

* [SocketAddr::set_ip]

* [SocketAddr::set_port]

* [SocketAddrV4::set_ip]

* [SocketAddrV4::set_port]

* [SocketAddrV6::set_ip]

* [SocketAddrV6::set_port]

* [SocketAddrV6::set_flowinfo]

* [SocketAddrV6::set_scope_id]

* [slice::copy_from_slice]

* [ptr::read_volatile]

* [ptr::write_volatile]

* [OpenOptions::create_new]

* [TcpStream::set_nodelay]

* [TcpStream::nodelay]

* [TcpStream::set_ttl]

* [TcpStream::ttl]

* [TcpStream::set_only_v6]

* [TcpStream::only_v6]

* [TcpStream::take_error]

* [TcpStream::set_nonblocking]

* [TcpListener::set_ttl]

* [TcpListener::ttl]

* [TcpListener::set_only_v6]

* [TcpListener::only_v6]

* [TcpListener::take_error]

* [TcpListener::set_nonblocking]

* [UdpSocket::set_broadcast]

* [UdpSocket::broadcast]

* [UdpSocket::set_multicast_loop_v4]

* [UdpSocket::multicast_loop_v4]

* [UdpSocket::set_multicast_ttl_v4]

* [UdpSocket::multicast_ttl_v4]

* [UdpSocket::set_multicast_loop_v6]

* [UdpSocket::multicast_loop_v6]

* [UdpSocket::set_multicast_ttl_v6]

* [UdpSocket::multicast_ttl_v6]

* [UdpSocket::set_ttl]

* [UdpSocket::ttl]

* [UdpSocket::set_only_v6]

* [UdpSocket::only_v6]

* [UdpSocket::join_multicast_v4]

* [UdpSocket::join_multicast_v6]

* [UdpSocket::leave_multicast_v4]

* [UdpSocket::leave_multicast_v6]

* [UdpSocket::take_error]

* [UdpSocket::connect]

* [UdpSocket::send]

* [UdpSocket::recv]

* [UdpSocket::set_nonblocking]

Libraries

---------

* [std::sync::Once is poisoned if its initialization function

fails][1.9o].

* [cell::Ref and cell::RefMut can contain unsized types][1.9cu].

* [Most types implement fmt::Debug][1.9db].

* [The default buffer size used by BufReader and BufWriter was

reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size

used by other languages.

* [Instant, SystemTime and Duration implement += and -=.

Duration additionally implements *= and /=][1.9ta].

* [Skip is a DoubleEndedIterator][1.9sk].

* [From<[u8; 4]> is implemented for Ipv4Addr][1.9fi].

* [Chain implements BufRead][1.9ch].

* [HashMap, HashSet and iterators are covariant][1.9hc].

Cargo

-----

* [Cargo can now run concurrently][1.9cc].

* [Top-level overrides allow specific revisions of crates to be

overridden through the entire crate graph][1.9ct]. This is intended

to make upgrades easier for large projects, by allowing crates to be

forked temporarily until they've been upgraded and republished.

* [Cargo exports a CARGO_PKG_AUTHORS environment variable][1.9cp].

* [Cargo will pass the contents of the RUSTFLAGS variable to rustc

on the commandline][1.9cf]. rustc arguments can also be specified

in the build.rustflags configuration key.

Performance

-----------

* [The time complexity of comparing variables for equivalence during type

unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads

to major compilation time improvement in some scenarios.

* [ToString is specialized for str, giving it the same performance

as to_owned][1.9ts].

* [Spawning processes with Command::output no longer creates extra

threads][1.9sp].

* [#[derive(PartialEq)] and #[derive(PartialOrd)] emit less code

for C-like enums][1.9cl].

Misc

----

* [Passing the --quiet flag to a test runner will produce

much-abbreviated output][1.9q].

* The Rust Project now publishes std binaries for the

mips-unknown-linux-musl, mipsel-unknown-linux-musl, and i586-pc-windows-msvc targets.

Compatibility Notes

-------------------

* [std::sync::Once is poisoned if its initialization function

fails][1.9o].

* [It is illegal to define methods with the same name in overlapping

inherent impl blocks][1.9sn].

* [fn item types are zero sized, and each fn names a unique

type][1.9fn]. This will break code that transmutes fns, so calling

transmute on a fn type will generate a warning for a few cycles,

then will be converted to an error.

* [Improvements to const evaluation may trigger new errors when integer

literals are out of range][1.9ce].

[1.9bf]: https://github.com/rust-lang/rust/pull/32695

[1.9cc]: https://github.com/rust-lang/cargo/pull/2486

[1.9ce]: https://github.com/rust-lang/rust/pull/30587

[1.9cf]: https://github.com/rust-lang/cargo/pull/2241

[1.9ch]: https://github.com/rust-lang/rust/pull/32541

[1.9cl]: https://github.com/rust-lang/rust/pull/31977

[1.9cp]: https://github.com/rust-lang/cargo/pull/2465

[1.9ct]: https://github.com/rust-lang/cargo/pull/2385

[1.9cu]: https://github.com/rust-lang/rust/pull/32652

[1.9db]: https://github.com/rust-lang/rust/pull/32054

[1.9fi]: https://github.com/rust-lang/rust/pull/32050

[1.9fn]: https://github.com/rust-lang/rust/pull/31710

[1.9fv]: https://github.com/rust-lang/rust/pull/31938

[1.9hc]: https://github.com/rust-lang/rust/pull/32635

[1.9o]: https://github.com/rust-lang/rust/pull/32325

[1.9q]: https://github.com/rust-lang/rust/pull/31887

[1.9sk]: https://github.com/rust-lang/rust/pull/31700

[1.9sn]: https://github.com/rust-lang/rust/pull/31925

[1.9sp]: https://github.com/rust-lang/rust/pull/31618

[1.9ta]: https://github.com/rust-lang/rust/pull/32448

[1.9ts]: https://github.com/rust-lang/rust/pull/32586

[1.9tu]: https://github.com/rust-lang/rust/pull/32062

[1.9ws]: https://github.com/rust-lang/rust/pull/29734

[RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md

[<*const T>::as_ref]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref

[<*mut T>::as_mut]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut

[<*mut T>::as_ref]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref

[slice::copy_from_slice]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice

[AsciiExt::make_ascii_lowercase]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase

[AsciiExt::make_ascii_uppercase]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase

[BTreeSet::get]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get

[BTreeSet::replace]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace

[BTreeSet::take]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take

[CommandExt::exec]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec

[File::try_clone]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone

[HashMap::hasher]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher

[HashSet::get]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get

[HashSet::hasher]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher

[HashSet::replace]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace

[HashSet::take]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take

[JoinHandleExt::as_pthread_t]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t

[JoinHandleExt::into_pthread_t]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t

[JoinHandleExt]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html

[OpenOptions::create_new]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new

[OsStr::is_empty]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty

[OsStr::len]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len

[OsString::capacity]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity

[OsString::clear]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear

[OsString::reserve_exact]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact

[OsString::reserve]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve

[OsString::with_capacity]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity

[RawPthread]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html

[SocketAddr::set_ip]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip

[SocketAddr::set_port]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port

[SocketAddrV4::set_ip]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip

[SocketAddrV4::set_port]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port

[SocketAddrV6::set_flowinfo]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo

[SocketAddrV6::set_ip]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip

[SocketAddrV6::set_port]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port

[SocketAddrV6::set_scope_id]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id

[TcpListener::only_v6]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6

[TcpListener::set_nonblocking]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking

[TcpListener::set_only_v6]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6

[TcpListener::set_ttl]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl

[TcpListener::take_error]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error

[TcpListener::ttl]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl

[TcpStream::nodelay]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay

[TcpStream::only_v6]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6

[TcpStream::set_nodelay]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay

[TcpStream::set_nonblocking]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking

[TcpStream::set_only_v6]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6

[TcpStream::set_ttl]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl

[TcpStream::take_error]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error

[TcpStream::ttl]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl

[UdpSocket::broadcast]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast

[UdpSocket::connect]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect

[UdpSocket::join_multicast_v4]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4

[UdpSocket::join_multicast_v6]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6

[UdpSocket::leave_multicast_v4]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4

[UdpSocket::leave_multicast_v6]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6

[UdpSocket::multicast_loop_v4]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4

[UdpSocket::multicast_loop_v6]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6

[UdpSocket::multicast_ttl_v4]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4

[UdpSocket::multicast_ttl_v6]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6

[UdpSocket::only_v6]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6

[UdpSocket::recv]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv

[UdpSocket::send]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send

[UdpSocket::set_broadcast]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast

[UdpSocket::set_multicast_loop_v4]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4

[UdpSocket::set_multicast_loop_v6]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6

[UdpSocket::set_multicast_ttl_v4]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4

[UdpSocket::set_multicast_ttl_v6]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6

[UdpSocket::set_nonblocking]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking

[UdpSocket::set_only_v6]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6

[UdpSocket::set_ttl]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl

[UdpSocket::take_error]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error

[UdpSocket::ttl]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl

[char::DecodeUtf16Error::unpaired_surrogate]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate

[char::DecodeUtf16Error]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html

[char::DecodeUtf16]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html

[char::decode_utf16]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html

[ptr::read_volatile]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html

[ptr::write_volatile]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html

[std::os::unix::thread]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html

[std::panic::AssertUnwindSafe]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html

[std::panic::UnwindSafe]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html

[std::panic::catch_unwind]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html

[std::panic::resume_unwind]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html

[std::panic]: http://doc.rust-lang.org/nightly/std/panic/index.html

[str::is_char_boundary]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary