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Update release notes for 1.7
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@brson
brson committed Jan 29, 2016
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Version 1.7.0 (2016-03-03)
==========================

Language
--------

* Soundness fixes to the interactions between associated types and
lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
code that violates the new rules. This is a significant change that
is known to break existing code, so it has emitted warnings for the
new error cases since 1.4 to give crate authors time to adapt. The
details of what is changing are subtle; read the RFC for more.

Libraries
---------

* Stabilized APIs:
[`Path::strip_prefix`][] (renamed from relative_from),
[`path::StripPrefixError`][] (new error type returned from strip_prefix),
[`Ipv4Addr::is_loopback`],
[`Ipv4Addr::is_private`],
[`Ipv4Addr::is_link_local`],
[`Ipv4Addr::is_multicast`],
[`Ipv4Addr::is_broadcast`],
[`Ipv4Addr::is_documentation`],
[`Ipv6Addr::is_unspecified`],
[`Ipv6Addr::is_loopback`],
[`Ipv6Addr::is_multicast`],
[`Vec::as_slice`],
[`Vec::as_mut_slice`],
[`String::as_str`],
[`String::as_mut_str`],
`<[T]>::`[`clone_from_slice`], which now requires the two slices to
be the same length
`<[T]>::`[`sort_by_key`],
[`i32::checked_rem`],
[`i32::checked_neg`],
[`i32::checked_shl`],
[`i32::checked_shr`],
[`i32::saturating_mul`],
[`i32::overflowing_add`],
[`i32::overflowing_sub`],
[`i32::overflowing_mul`],
[`i32::overflowing_div`],
[`i32::overflowing_rem`],
[`i32::overflowing_neg`],
[`i32::overflowing_shl`],
[`i32::overflowing_shr`],
[`u32::checked_rem`],
[`u32::checked_neg`],
[`u32::checked_shl`],
[`u32::checked_shl`],
[`u32::saturating_mul`],
[`u32::overflowing_add`],
[`u32::overflowing_sub`],
[`u32::overflowing_mul`],
[`u32::overflowing_div`],
[`u32::overflowing_rem`],
[`u32::overflowing_neg`],
[`u32::overflowing_shl`],
[`u32::overflowing_shr`],
checked, saturated, and overflowing operations for other primitive types,
[`ffi::IntoStringError`],
[`CString::into_string`],
[`CString::into_bytes`],
[`CString::into_bytes_with_nul`],
`From<CString> for Vec<u8>`,
[`IntoStringError::into_cstring`],
[`IntoStringError::utf8_error`],
`Error for IntoStringError`.
* [Validating UTF-8 is faster by a factor of between 7 and 14x for
ASCII input][1.7utf8]. This means that creating `String`s and `str`s
from bytes is faster.
* [The performance of `LineWriter` (and thus `io::stdout`) was
improved by using `memchr` to search for newlines][1.7m].
* [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
`f64` variants were stabilized previously.
* [`BTreeMap` was rewritten to use less memory improve performance of
insertion and iteration, the latter by as much as 5x`][1.7bm].
* [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
covariant over their contained type][1.7bt].
* [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
over their contained type][1.7ll].
* [`str::replace` now accepts a `Pattern`][1.7rp], like other string
searching methods.
* [`Any` is implemented for unsized types][1.7a].
* [`Hash` is implemented for `Duration`][1.7h].

Misc
----

* [The `--error-format=json` flag to `rustc` causes it to emit errors
in JSON format][1.7j]. This is an unstable flag and so also requires
the `-Z unstable-options` flag.
* [When running tests with `--test`, rustdoc will pass `--cfg`
arguments to the compiler][1.7dt].
* [The compiler is built with RPATH information by default][1.7rp].
This means that it will be possible to run `rustc` when installed in
unusual configurations without configuring the dynamic linker search
path explicitly.
* [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dt]. This makes
any RPATH entries (emitted with `-C rpath`) *not* take precedence
over `LD_LIBRARY_PATH`.

Cargo
-----

* [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
* [The `rerun-if-changed` build script directive no longer causes the
build script to incorrectly run twice in certain scenarios][1.7rr].

Compatibility Notes
-------------------

* [Several bugs in the compiler's visibility calculations were
fixed][1.7v]. Since this was found to break significant amounts of
code, the new errors will be emitted as warnings for several release
cycles, under the `private_in_public` lint.
* Defaulted type parameters were accidentally accepted in positions
that were not intended. In this release, [defaulted type parameters
appearing outside of type definitions will generate a
warning][1.7d], which will become an error in future releases.
* [Parsing "." as a float results in an error instead of
0][1.7p]. That is, `".".parse::<f32>()` returns `Err`, not `Ok(0)`.
* [Borrows of closure parameters may not outlive the closure][1.7bc].

[1.7a]: https://github.com/rust-lang/rust/pull/30928
[1.7bc]: https://github.com/rust-lang/rust/pull/30341
[1.7bm]: https://github.com/rust-lang/rust/pull/30426
[1.7bt]: https://github.com/rust-lang/rust/pull/30998
[1.7cp]: https://github.com/rust-lang/cargo/pull/2224
[1.7d]: https://github.com/rust-lang/rust/pull/30724
[1.7dt]: https://github.com/rust-lang/rust/pull/30372
[1.7dt]: https://github.com/rust-lang/rust/pull/30394
[1.7f]: https://github.com/rust-lang/rust/pull/30672
[1.7h]: https://github.com/rust-lang/rust/pull/30818
[1.7j]: https://github.com/rust-lang/rust/pull/30711
[1.7ll]: https://github.com/rust-lang/rust/pull/30663
[1.7m]: https://github.com/rust-lang/rust/pull/30381
[1.7p]: https://github.com/rust-lang/rust/pull/30681
[1.7rp]: https://github.com/rust-lang/rust/pull/29498
[1.7rp]: https://github.com/rust-lang/rust/pull/30353
[1.7rr]: https://github.com/rust-lang/cargo/pull/2279
[1.7sf]: https://github.com/rust-lang/rust/pull/30389
[1.7utf8]: https://github.com/rust-lang/rust/pull/30740
[1.7v]: https://github.com/rust-lang/rust/pull/29973
[RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
[`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
[`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
[`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
[`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
[`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
[`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
[`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
[`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
[`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
[`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
[`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
[`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
[`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
[`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
[`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
[`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
[`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
[`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
[`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
[`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
[`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
[`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
[`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
[`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
[`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
[`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
[`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
[`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
[`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
[`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
[`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
[`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
[`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
[`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
[`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
[`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
[`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
[`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
[`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
[`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
[`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
[`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
[`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
[`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
[`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
[`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
[`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul


Version 1.6.0 (2016-01-21)
==========================

Expand All @@ -16,8 +213,9 @@ Libraries
---------

* Stabilized APIs:
[`Read::read_exact`], [`ErrorKind::UnexpectedEof`] (renamed from
`UnexpectedEOF`), [`fs::DirBuilder`], [`fs::DirBuilder::new`],
[`Read::read_exact`],
[`ErrorKind::UnexpectedEof`][] (renamed from `UnexpectedEOF`),
[`fs::DirBuilder`], [`fs::DirBuilder::new`],
[`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
[`os::unix::fs::DirBuilderExt`],
[`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
Expand All @@ -29,10 +227,11 @@ Libraries
[`collections::hash_set::HashSet::drain`],
[`collections::binary_heap::Drain`],
[`collections::binary_heap::BinaryHeap::drain`],
[`Vec::extend_from_slice`] (renamed from `push_all`),
[`Vec::extend_from_slice`][] (renamed from `push_all`),
[`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
[`RwLock::into_inner`], [`Iterator::min_by_key`] (renamed from
`min_by`), [`Iterator::max_by_key`] (renamed from `max_by`).
[`RwLock::into_inner`],
[`Iterator::min_by_key`][] (renamed from `min_by`),
[`Iterator::max_by_key`][] (renamed from `max_by`).
* The [core library][1.6co] is stable, as are most of its APIs.
* [The `assert_eq!` macro supports arguments that don't implement
`Sized`][1.6ae], such as arrays. In this way it behaves more like
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