Rust 1. 4 发布，更新内容如下：

重点

• Windows builds targeting the 64-bit MSVC ABI and linker (instead of GNU) are now supported and recommended for use.

重大更新

• Several changes have been made to fix type soundness and improve the behavior of associated types. See RFC 1214. Although we have mostly introduced these changes as warnings this release, to become errors next release, there are still some scenarios that will see immediate breakage.

• The str::lines and BufRead::lines iterators treat \r\n as line breaks in addition to \n.

• Loans of 'static lifetime extend to the end of a function.

语言

• use statements that import multiple items can now rename them, as in use foo::{bar as kitten, baz as puppy}.

• Binops work correctly on fat pointers.

• pub extern crate, which does not behave as expected, issues a warning until a better solution is found.

Libraries

• Many APIs were stabilized: <Box<str>>::into_string,Arc::downgrade, Arc::get_mut, Arc::make_mut,Arc::try_unwrap, Box::from_raw, Box::into_raw, CStr::to_str,CStr::to_string_lossy, CString::from_raw, CString::into_raw,IntoRawFd::into_raw_fd, IntoRawFd,IntoRawHandle::into_raw_handle, IntoRawHandle,IntoRawSocket::into_raw_socket, IntoRawSocket, Rc::downgrade,Rc::get_mut, Rc::make_mut, Rc::try_unwrap, Result::expect,String::into_boxed_str, TcpStream::read_timeout,TcpStream::set_read_timeout, TcpStream::set_write_timeout,TcpStream::write_timeout, UdpSocket::read_timeout,UdpSocket::set_read_timeout, UdpSocket::set_write_timeout,UdpSocket::write_timeout, Vec::append, Vec::split_off,VecDeque::append, VecDeque::retain, VecDeque::split_off,rc::Weak::upgrade, rc::Weak, slice::Iter::as_slice,slice::IterMut::into_slice, str::CharIndices::as_str,str::Chars::as_str, str::split_at_mut, str::split_at,sync::Weak::upgrade, sync::Weak, thread::park_timeout,thread::sleep.

• Some APIs were deprecated: BTreeMap::with_b,BTreeSet::with_b, Option::as_mut_slice, Option::as_slice,Result::as_mut_slice, Result::as_slice, f32::from_str_radix,f64::from_str_radix.

• Reverse-searching strings is faster with the 'two-way' algorithm.

• std::io::copy allows ?Sized arguments.

• The Windows, Chunks, and ChunksMut iterators over slices alloverride count, nth and last with an O(1) implementation.

• Default is implemented for arrays up to [T; 32].

• IntoRawFd has been added to the Unix-specific prelude,IntoRawSocket and IntoRawHandle to the Windows-specific prelude.

• Extend<String> and FromIterator<String are both implemented forString.

• IntoIterator is implemented for Option<&T> andResult<&T>.

• HashMap and HashSet implement Extend<&T> where T: Copy as part of RFC 839.

• BinaryHeap implements Debug.

• Borrow and BorrowMut are implemented for fixed-size arrays.

• extern fns of with the "Rust" and "C" ABIs implement common traits including Eq, Ord, Debug, Hash.

• String comparison is faster.

• &mut T where T: Write also implements Write.

• A stable regression in VecDec::push_back that caused panics for zero-sized types was fixed.

• Function pointers implement traits for up to 12 parameters.

Miscellaneous

• The compiler no longer uses the 'morestack' feature to prevent stack overflow. Instead it uses guard pages and stack probes (though stack probes are not yet implemented on any platform but Windows).

• The compiler matches traits faster when projections are involved.

• The 'improper_ctypes' lint no longer warns about use of isize andusize.

• Cargo now displays useful information about what its doing duringcargo update.

更新日志：RELEASES.md

下载地址：1.4.0

文章转载自：开源中国社区 [http://www.oschina.net]