1.4 release notes
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Brian Anderson
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RELEASES.md
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RELEASES.md
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Version 1.4.0 (October 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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* Windows builds targeting the 64-bit MSVC ABI and linker (instead of
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GNU) are now supported and recommended for use.
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Breaking Changes
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----------------
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* [Several changes have been made to fix type soundness and improve
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the behavior of associated types][sound]. See [RFC 1214]. Although
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we have mostly introduced these changes as warnings this release, to
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become errors next release, there are still some scenarios that will
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see immediate breakage.
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* [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
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line breaks in addition to `\n`][crlf].
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* [Loans of `'static` lifetime extend to the end of a function][stat].
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Language
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--------
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* `use` statements that import multiple items [can now rename
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them][i], as in `use foo::{bar as kitten, baz as puppy}`.
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* [Binops work correctly on fat pointers][binfat].
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* `pub extern crate`, which does not behave as expected, [issues a
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warning][pec] until a better solution is found.
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Libraries
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---------
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* [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
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[`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
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[`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
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[`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
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[`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
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`IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
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`IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
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[`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
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[`String::into_boxed_str`], [`TcpStream::read_timeout`],
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[`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
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[`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
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[`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
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[`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
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[`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
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[`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
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[`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
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[`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
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[`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
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[`thread::sleep`].
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* [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
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`BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
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`Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
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`f64::from_str_radix`.
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* [Reverse-searching strings is faster with the 'two-way'
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algorithm][s].
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* [`std::io::copy` allows `?Sized` arguments][cc].
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* The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
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[override `count`, `nth` and `last` with an O(1)
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implementation][it].
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* [`Default` is implemented for arrays up to `[T; 32]`][d].
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* [`IntoRawFd` has been added to the Unix-specific prelude,
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`IntoRawSocket` and `IntoRawHandle` to the Windows-specific
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prelude][pr].
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* [`Extend<String>` and `FromIterator<String` are both implemented for
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`String`][es].
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* [`IntoIterator` is implemented for `Option<&T>` and
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`Result<&T>`][into].
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* [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
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Copy`][ext] as part of [RFC 839].
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* [`BinaryHeap` implements `Debug`][bh2].
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* [`Borrow` and `BorrowMut` are implemented for fixed-size
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arrays][bm].
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* [`extern fn`s of with the "Rust" and "C" ABIs implement common
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traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
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* [String comparison is faster][faststr].
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* `&mut T` where `T: Write` [also implements `Write`][mutw].
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* [A stable regression in `VecDec::push_back` that caused panics for
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zero-sized types was fixed][vd].
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* [Function pointers implement traits for up to 12 parameters][fp2].
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Miscellaneous
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-------------
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* The compiler [no longer uses the 'morestack' feature to prevent
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stack overflow][mm]. Instead it uses guard pages and stack
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probes (though stack probes are not yet implemented on any platform
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but Windows).
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* [The compiler matches traits faster when projections are involved][p].
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* The 'improper_ctypes' lint [no longer warns about use of `isize` and
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`usize`][ffi].
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* [Cargo now displays useful information about what its doing during
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`cargo update`][cu].
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[`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
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[`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
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[`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
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[`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
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[`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
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[`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
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[`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
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[`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
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[`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
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[`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
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[`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
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[`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
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[`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
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[`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
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[`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
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[`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
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[`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
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[`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
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[`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
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[`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
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[`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
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[`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
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[`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
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[`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
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[`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
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[`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
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[`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
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[`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
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[`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
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[`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
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[`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
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[`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
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[`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
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[`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
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[`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
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[`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
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[`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
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[`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
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[`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
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[`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
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[`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
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[bh2]: https://github.com/rust-lang/rust/pull/28156
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[binfat]: https://github.com/rust-lang/rust/pull/28270
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[bm]: https://github.com/rust-lang/rust/pull/28197
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[cc]: https://github.com/rust-lang/rust/pull/27531
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[crlf]: https://github.com/rust-lang/rust/pull/28034
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[cu]: https://github.com/rust-lang/cargo/pull/1931
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[d]: https://github.com/rust-lang/rust/pull/27825
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[dep]: https://github.com/rust-lang/rust/pull/28339
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[es]: https://github.com/rust-lang/rust/pull/27956
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[ext]: https://github.com/rust-lang/rust/pull/28094
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[faststr]: https://github.com/rust-lang/rust/pull/28338
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[ffi]: https://github.com/rust-lang/rust/pull/28779
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[fp]: https://github.com/rust-lang/rust/pull/28268
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[fp2]: https://github.com/rust-lang/rust/pull/28560
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[i]: https://github.com/rust-lang/rust/pull/27451
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[into]: https://github.com/rust-lang/rust/pull/28039
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[it]: https://github.com/rust-lang/rust/pull/27652
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[mm]: https://github.com/rust-lang/rust/pull/27338
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[mutw]: https://github.com/rust-lang/rust/pull/28368
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[sound]: https://github.com/rust-lang/rust/pull/27641
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[p]: https://github.com/rust-lang/rust/pull/27866
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[pec]: https://github.com/rust-lang/rust/pull/28486
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[pr]: https://github.com/rust-lang/rust/pull/27896
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[RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
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[RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
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[s]: https://github.com/rust-lang/rust/pull/27474
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[stab]: https://github.com/rust-lang/rust/pull/28339
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[stat]: https://github.com/rust-lang/rust/pull/28321
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[vd]: https://github.com/rust-lang/rust/pull/28494
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Version 1.3.0 (2015-09-17)
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==============================
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