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Auto merge of #32892 - brson:relnotes19, r=alexcrichton
Release notes for 1.9
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‎RELEASES.md

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Version 1.9.0 (2016-05-26)
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==========================
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Language
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--------
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* The `#[deprecated]` attribute when applied to an API will generate
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warnings when used. The warnings may be suppressed with
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`#[allow(deprecated)]`. [RFC 1270].
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* [`fn` item types are zero sized, and each `fn` names a unique
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type][1.9fn]. This will break code that transmutes `fn`s, so calling
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`transmute` on a `fn` type will generate a warning for a few cycles,
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then will be converted to an error.
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* [Field and method resolution understand visibility, so private
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fields and methods cannot prevent the proper use of public fields
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and methods][1.9fv].
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* [The parser considers unicode codepoints in the
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`PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
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Stabilized APIs
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---------------
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* [`std::panic`]
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* [`std::panic::catch_unwind`][] (renamed from `recover`)
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* [`std::panic::resume_unwind`][] (renamed from `propagate`)
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* [`std::panic::AssertUnwindSafe`][] (renamed from `AssertRecoverSafe`)
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* [`std::panic::UnwindSafe`][] (renamed from `RecoverSafe`)
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* [`str::is_char_boundary`]
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* [`<*const T>::as_ref`]
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* [`<*mut T>::as_ref`]
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* [`<*mut T>::as_mut`]
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* [`AsciiExt::make_ascii_uppercase`]
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* [`AsciiExt::make_ascii_lowercase`]
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* [`char::decode_utf16`]
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* [`char::DecodeUtf16`]
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* [`char::DecodeUtf16Error`]
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* [`char::DecodeUtf16Error::unpaired_surrogate`]
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* [`BTreeSet::take`]
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* [`BTreeSet::replace`]
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* [`BTreeSet::get`]
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* [`HashSet::take`]
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* [`HashSet::replace`]
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* [`HashSet::get`]
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* [`OsString::with_capacity`]
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* [`OsString::clear`]
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* [`OsString::capacity`]
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* [`OsString::reserve`]
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* [`OsString::reserve_exact`]
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* [`OsStr::is_empty`]
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* [`OsStr::len`]
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* [`std::os::unix::thread`]
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* [`RawPthread`]
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* [`JoinHandleExt`]
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* [`JoinHandleExt::as_pthread_t`]
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* [`JoinHandleExt::into_pthread_t`]
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* [`HashSet::hasher`]
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* [`HashMap::hasher`]
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* [`CommandExt::exec`]
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* [`File::try_clone`]
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* [`SocketAddr::set_ip`]
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* [`SocketAddr::set_port`]
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* [`SocketAddrV4::set_ip`]
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* [`SocketAddrV4::set_port`]
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* [`SocketAddrV6::set_ip`]
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* [`SocketAddrV6::set_port`]
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* [`SocketAddrV6::set_flowinfo`]
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* [`SocketAddrV6::set_scope_id`]
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* [`slice::copy_from_slice`]
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* [`ptr::read_volatile`]
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* [`ptr::write_volatile`]
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* [`OpenOptions::create_new`]
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* [`TcpStream::set_nodelay`]
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* [`TcpStream::nodelay`]
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* [`TcpStream::set_ttl`]
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* [`TcpStream::ttl`]
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* [`TcpStream::set_only_v6`]
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* [`TcpStream::only_v6`]
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* [`TcpStream::take_error`]
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* [`TcpStream::set_nonblocking`]
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* [`TcpListener::set_ttl`]
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* [`TcpListener::ttl`]
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* [`TcpListener::set_only_v6`]
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* [`TcpListener::only_v6`]
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* [`TcpListener::take_error`]
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* [`TcpListener::set_nonblocking`]
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* [`UdpSocket::set_broadcast`]
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* [`UdpSocket::broadcast`]
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* [`UdpSocket::set_multicast_loop_v4`]
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* [`UdpSocket::multicast_loop_v4`]
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* [`UdpSocket::set_multicast_ttl_v4`]
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* [`UdpSocket::multicast_ttl_v4`]
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* [`UdpSocket::set_multicast_loop_v6`]
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* [`UdpSocket::multicast_loop_v6`]
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* [`UdpSocket::set_multicast_ttl_v6`]
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* [`UdpSocket::multicast_ttl_v6`]
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* [`UdpSocket::set_ttl`]
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* [`UdpSocket::ttl`]
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* [`UdpSocket::set_only_v6`]
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* [`UdpSocket::only_v6`]
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* [`UdpSocket::join_multicast_v4`]
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* [`UdpSocket::join_multicast_v6`]
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* [`UdpSocket::leave_multicast_v4`]
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* [`UdpSocket::leave_multicast_v6`]
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* [`UdpSocket::take_error`]
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* [`UdpSocket::connect`]
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* [`UdpSocket::send`]
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* [`UdpSocket::recv`]
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* [`UdpSocket::set_nonblocking`]
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Libraries
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---------
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* [`std::sync::Once` is poisoned if its initialization function
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fails][1.9o].
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* [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
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* [Most types implement `fmt::Debug`][1.9db].
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* [The default buffer size used by `BufReader` and `BufWriter` was
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reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
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used by other languages.
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* [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
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`Duration` additionally implements `*=` and `/=`][1.9ta].
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* [`Skip` is a `DoubleEndedIterator`][1.9sk].
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* [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
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* [`Chain` implements `BufRead`][1.9ch].
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* [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
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Cargo
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-----
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* [Cargo can now run concurrently][1.9cc].
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* [Top-level overrides allow specific revisions of crates to be
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overridden through the entire crate graph][1.9ct]. This is intended
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to make upgrades easier for large projects, by allowing crates to be
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forked temporarily until they've been upgraded and republished.
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* [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
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* [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
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on the commandline][1.9cf]. `rustc` arguments can also be specified
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in the `build.rustflags` configuration key.
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Performance
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-----------
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* [During type unification, the complexity of comparing variables for
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equivalance was reduced from `O(n!)` to `O(n)`][1.9tu]. This leads
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to major compile-time improvements in some scenarios.
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* [`ToString` is specialized for `str`, giving it the same performance
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as `to_owned`][1.9ts].
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* [Spawning processes with `Command::output` no longer creates extra
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threads][1.9sp].
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* [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
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for C-like enums][1.9cl].
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Misc
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----
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* [Passing the `--quiet` flag to a test runner will produce
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much-abbreviated output][1.9q].
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* The Rust Project now publishes std binaries for the
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`mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
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`i586-pc-windows-msvc` targets.
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Compatibility Notes
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-------------------
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* [`std::sync::Once` is poisoned if its initialization function
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fails][1.9o].
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* [It is illegal to define methods with the same name in overlapping
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inherent `impl` blocks][1.9sn].
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* [`fn` item types are zero sized, and each `fn` names a unique
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type][1.9fn]. This will break code that transmutes `fn`s, so calling
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`transmute` on a `fn` type will generate a warning for a few cycles,
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then will be converted to an error.
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* [Improvements to const evaluation may trigger new errors when integer
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literals are out of range][1.9ce].
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[1.9bf]: https://github.com/rust-lang/rust/pull/32695
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[1.9cc]: https://github.com/rust-lang/cargo/pull/2486
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[1.9ce]: https://github.com/rust-lang/rust/pull/30587
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[1.9cf]: https://github.com/rust-lang/cargo/pull/2241
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[1.9ch]: https://github.com/rust-lang/rust/pull/32541
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[1.9cl]: https://github.com/rust-lang/rust/pull/31977
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[1.9cp]: https://github.com/rust-lang/cargo/pull/2465
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[1.9ct]: https://github.com/rust-lang/cargo/pull/2385
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[1.9cu]: https://github.com/rust-lang/rust/pull/32652
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[1.9db]: https://github.com/rust-lang/rust/pull/32054
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[1.9fi]: https://github.com/rust-lang/rust/pull/32050
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[1.9fn]: https://github.com/rust-lang/rust/pull/31710
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[1.9fv]: https://github.com/rust-lang/rust/pull/31938
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[1.9hc]: https://github.com/rust-lang/rust/pull/32635
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[1.9o]: https://github.com/rust-lang/rust/pull/32325
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[1.9q]: https://github.com/rust-lang/rust/pull/31887
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[1.9sk]: https://github.com/rust-lang/rust/pull/31700
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[1.9sn]: https://github.com/rust-lang/rust/pull/31925
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[1.9sp]: https://github.com/rust-lang/rust/pull/31618
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[1.9ta]: https://github.com/rust-lang/rust/pull/32448
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[1.9ts]: https://github.com/rust-lang/rust/pull/32586
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[1.9tu]: https://github.com/rust-lang/rust/pull/32062
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[1.9ws]: https://github.com/rust-lang/rust/pull/29734
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[RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
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[`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
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[`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
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[`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
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[`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
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[`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
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[`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
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[`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
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[`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
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[`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
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[`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
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[`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
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[`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
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[`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
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[`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
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[`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
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[`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
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[`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
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[`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
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[`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
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[`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
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[`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
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[`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
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[`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
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[`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
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[`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
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[`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
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[`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
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[`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
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[`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
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[`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
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[`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
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[`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
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[`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
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[`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
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[`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
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[`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
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[`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
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[`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
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[`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
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[`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
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[`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
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[`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
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[`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
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[`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
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[`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
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[`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
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[`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
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[`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
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[`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
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[`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
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[`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
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[`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
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[`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
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[`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
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[`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
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[`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
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[`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
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[`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
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[`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
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[`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
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[`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
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[`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
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[`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
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[`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
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[`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
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[`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
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[`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
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[`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
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[`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
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[`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
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[`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
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[`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
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[`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
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[`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
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[`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
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[`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
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[`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
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[`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
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[`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
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[`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
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[`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
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[`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
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[`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
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[`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
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[`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
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[`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
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Version 1.8.0 (2016-04-14)
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==========================
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