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Release notes for 1.6
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‎RELEASES.md

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Version 1.6.0 (2016-01-21)
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==========================
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Language
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--------
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* The `#![no_std]` attribute causes a crate to not be linked to the
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standard library, but only the [core library][1.6co], as described
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in [RFC 1184]. The core library defines common types and traits but
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has no platform dependencies whatsoever, and is the basis for Rust
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software in environments that cannot support a full port of the
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standard library, such as operating systems. Most of the core
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library is now stable.
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Libraries
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---------
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* Stabilized APIs:
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[`Read::read_exact`], [`ErrorKind::UnexpectedEof`] (renamed from
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`UnexpectedEOF`), [`fs::DirBuilder`], [`fs::DirBuilder::new`],
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[`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
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[`os::unix::fs::DirBuilderExt`],
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[`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
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[`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
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[`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
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[`collections::hash_map::Drain`],
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[`collections::hash_map::HashMap::drain`],
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[`collections::hash_set::Drain`],
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[`collections::hash_set::HashSet::drain`],
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[`collections::binary_heap::Drain`],
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[`collections::binary_heap::BinaryHeap::drain`],
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[`Vec::extend_from_slice`] (renamed from `push_all`),
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[`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
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[`RwLock::into_inner`], [`Iterator::min_by_key`] (renamed from
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`min_by`), [`Iterator::max_by_key`] (renamed from `max_by`).
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* The [core library][1.6co] is stable, as are most of its APIs.
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* [The `assert_eq!` macro supports arguments that don't implement
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`Sized`][1.6ae], such as arrays. In this way it behaves more like
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`assert!`.
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* Several timer functions that take duration in milliseconds [are
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deprecated in favor of those that take `Duration`][1.6ms]. These
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include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
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`thread_park_timeout_ms`.
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* The algorithm by which `Vec` reserves additional elements was
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[tweaked to not allocate excessive space][1.6a] while still growing
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exponentially.
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* `From` conversions are [implemented from integers to floats][1.6f]
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in cases where the conversion is lossless. Thus they are not
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implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
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or `f64`. They are also not implemented for `isize` and `usize`
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because the implementations would be platform-specific. `From` is
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also implemented from `f32` to `f64`.
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* `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
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* `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
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* `IntoIterator` is implemented for `&PathBuf` and `&Path`.
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* [`BinaryHeap` was refactored][1.6bh] for modest performance
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improvements.
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* Sorting slices that are already sorted [is 50% faster in some
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cases][1.6s].
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Cargo
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-----
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* Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
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* Cargo build scripts can specify their dependencies by emitting the
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[`rerun-if-changed`][1.6rr] key.
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* crates.io will reject publication of crates with dependencies that
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have a wildcard version constraint. Crates with wildcard
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dependencies were seen to cause a variety of problems, as described
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in [RFC 1241]. Disallowing them will create more predictable
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development experience and a more stable ecosystem. Since 1.5
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publication of such crates has emitted a warning.
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* `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
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release folder. A variety of artifacts that Cargo failed to clean
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are now correctly deleted.
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Misc
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----
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* The `unreachable_code` lint [warns when a function call's argument
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diverges][1.6dv].
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* The parser indicates [failures that may be caused by
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confusingly-similar Unicode characters][1.6uc]
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* Certain macro errors [are reported at definition time][1.6m], not
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expansion.
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Compatibility Notes
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-------------------
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* The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
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environment variable when locating crates. This was a pre-cargo
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feature for integrating with the package manager that was
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accidentally never removed.
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* [A number of bugs were fixed in the privacy checker][1.6p] that
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could cause previously-accepted code to break.
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* [Modules and unit/tuple structs may not share the same name][1.6ts].
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* [Bugs in pattern matching unit structs were fixed][1.6us]: the tuple
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struct pattern syntax (`Foo(..)`) no longer can be used with unit
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structs; patterns that share the same name as a const are now an
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error.
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* A bug was fixed that causes [rustc not to apply default type
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parameters][1.6xc] when resolving certain method implementations of
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traits defined in other crates.
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[1.6a]: https://github.com/rust-lang/rust/pull/29454
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[1.6ae]: https://github.com/rust-lang/rust/pull/29770
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[1.6bh]: https://github.com/rust-lang/rust/pull/29811
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[1.6c]: https://github.com/rust-lang/cargo/pull/2192
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[1.6cc]: https://github.com/rust-lang/cargo/pull/2131
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[1.6co]: http://doc.rust-lang.org/beta/core/index.html
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[1.6dv]: https://github.com/rust-lang/rust/pull/30000
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[1.6f]: https://github.com/rust-lang/rust/pull/29129
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[1.6m]: https://github.com/rust-lang/rust/pull/29828
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[1.6ms]: https://github.com/rust-lang/rust/pull/29604
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[1.6p]: https://github.com/rust-lang/rust/pull/29726
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[1.6rp]: https://github.com/rust-lang/rust/pull/30034
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[1.6rr]: https://github.com/rust-lang/cargo/pull/2134
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[1.6s]: https://github.com/rust-lang/rust/pull/29675
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[1.6ts]: https://github.com/rust-lang/rust/issues/21546
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[1.6uc]: https://github.com/rust-lang/rust/pull/29837
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[1.6us]: https://github.com/rust-lang/rust/pull/29383
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[1.6xc]: https://github.com/rust-lang/rust/issues/30123
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[RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
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[RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
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[`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
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[`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
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[`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
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[`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
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[`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
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[`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
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[`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
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[`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
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[`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
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[`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
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[`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
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[`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
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[`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
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[`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
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[`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
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[`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
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[`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
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[`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
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[`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
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[`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
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[`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
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[`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
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[`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
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[`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
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[`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
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[`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
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[`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
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Version 1.5.0 (2015-12-10)
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==========================
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