Rust 1.16.0

Language

--------

* [The compiler's dead_code lint now accounts for type aliases][38051].

* [Uninhabitable enums (those without any variants) no longer permit wildcard

match patterns][38069]

* [Clean up semantics of self in an import list][38313]

* [Self may appear in impl headers][38920]

* [Self may appear in struct expressions][39282]

Compiler

--------

* [rustc now supports --emit=metadata, which causes rustc to emit

a .rmeta file containing only crate metadata][38571]. This can be

used by tools like the Rust Language Service to perform

metadata-only builds.

* [Levenshtein based typo suggestions now work in most places, while

previously they worked only for fields and sometimes for local

variables][38927]. Together with the overhaul of "no

resolution"/"unexpected resolution" errors (#[38154]) they result in

large and systematic improvement in resolution diagnostics.

* [Fix transmute:: where T requires a bigger alignment than

U][38670]

* [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]

* [rustc no longer attempts to provide "consider using an explicit

lifetime" suggestions][37057]. They were inaccurate.

Stabilized APIs

---------------

* [VecDeque::truncate]

* [VecDeque::resize]

* [String::insert_str]

* [Duration::checked_add]

* [Duration::checked_sub]

* [Duration::checked_div]

* [Duration::checked_mul]

* [str::replacen]

* [str::repeat]

* [SocketAddr::is_ipv4]

* [SocketAddr::is_ipv6]

* [IpAddr::is_ipv4]

* [IpAddr::is_ipv6]

* [Vec::dedup_by]

* [Vec::dedup_by_key]

* [Result::unwrap_or_default]

[<const T>::wrapping_offset] [<mut T>::wrapping_offset]

* CommandExt::creation_flags

* [File::set_permissions]

* [String::split_off]

Libraries

---------

* [[T]::binary_search and [T]::binary_search_by_key now take

their argument by Borrow parameter][37761]

* [All public types in std implement Debug][38006]

* [IpAddr implements From and From][38327]

* [Ipv6Addr implements From<[u16; 8]>][38131]

* [Ctrl-Z returns from Stdin.read() when reading from the console on

Windows][38274]

* [std: Fix partial writes in LineWriter][38062]

* [std: Clamp max read/write sizes on Unix][38622]

* [Use more specific panic message for &str slicing errors][38066]

* [TcpListener::set_only_v6 is deprecated][38304]. This

functionality cannot be achieved in std currently.

* [writeln!, like println!, now accepts a form with no string

or formatting arguments, to just print a newline][38469]

* [Implement iter::Sum and iter::Product for Result][38580]

* [Reduce the size of static data in std_unicode::tables][38781]

* [char::EscapeDebug, EscapeDefault, EscapeUnicode,

CaseMappingIter, ToLowercase, ToUppercase, implement Display][38909]

* [Duration implements Sum][38712]

* [String implements ToSocketAddrs][39048]

Cargo

-----

* [The cargo check command does a type check of a project without

building it][cargo/3296]

* [crates.io will display CI badges from Travis and AppVeyor, if

specified in Cargo.toml][cargo/3546]

* [crates.io will display categories listed in Cargo.toml][cargo/3301]

* [Compilation profiles accept integer values for debug, in addition

to true and false. These are passed to rustc as the value to

-C debuginfo][cargo/3534]

* [Implement cargo --version --verbose][cargo/3604]

* [All builds now output 'dep-info' build dependencies compatible with

make and ninja][cargo/3557]

* [Build all workspace members with build --all][cargo/3511]

* [Document all workspace members with doc --all][cargo/3515]

* [Path deps outside workspace are not members][cargo/3443]

Misc

----

* [rustdoc has a --sysroot argument that, like rustc, specifies

the path to the Rust implementation][38589]

* [The armv7-linux-androideabi target no longer enables NEON

extensions, per Google's ABI guide][38413]

* [The stock standard library can be compiled for Redox OS][38401]

* [Rust has initial SPARC support][38726]. Tier 3. No builds

available.

* [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No

builds available.

* [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]

Compatibility Notes

-------------------

* [Uninhabitable enums (those without any variants) no longer permit wildcard

match patterns][38069]

* In this release, references to uninhabited types can not be

pattern-matched. This was accidentally allowed in 1.15.

* [The compiler's dead_code lint now accounts for type aliases][38051].

* [Ctrl-Z returns from Stdin.read() when reading from the console on

Windows][38274]

* [Clean up semantics of self in an import list][38313]

* Reimplemented lifetime elision. This change was almost entirely compatible

with existing code, but it did close a number of small bugs and loopholes,

as well as being more accepting in some other [cases][41105].

[37057]: https://github.com/rust-lang/rust/pull/37057

[37761]: https://github.com/rust-lang/rust/pull/37761

[38006]: https://github.com/rust-lang/rust/pull/38006

[38051]: https://github.com/rust-lang/rust/pull/38051

[38062]: https://github.com/rust-lang/rust/pull/38062

[38622]: https://github.com/rust-lang/rust/pull/38622

[38066]: https://github.com/rust-lang/rust/pull/38066

[38069]: https://github.com/rust-lang/rust/pull/38069

[38131]: https://github.com/rust-lang/rust/pull/38131

[38154]: https://github.com/rust-lang/rust/pull/38154

[38274]: https://github.com/rust-lang/rust/pull/38274

[38304]: https://github.com/rust-lang/rust/pull/38304

[38313]: https://github.com/rust-lang/rust/pull/38313

[38327]: https://github.com/rust-lang/rust/pull/38327

[38401]: https://github.com/rust-lang/rust/pull/38401

[38413]: https://github.com/rust-lang/rust/pull/38413

[38469]: https://github.com/rust-lang/rust/pull/38469

[38559]: https://github.com/rust-lang/rust/pull/38559

[38571]: https://github.com/rust-lang/rust/pull/38571

[38580]: https://github.com/rust-lang/rust/pull/38580

[38589]: https://github.com/rust-lang/rust/pull/38589

[38670]: https://github.com/rust-lang/rust/pull/38670

[38712]: https://github.com/rust-lang/rust/pull/38712

[38726]: https://github.com/rust-lang/rust/pull/38726

[38781]: https://github.com/rust-lang/rust/pull/38781

[38798]: https://github.com/rust-lang/rust/pull/38798

[38909]: https://github.com/rust-lang/rust/pull/38909

[38920]: https://github.com/rust-lang/rust/pull/38920

[38927]: https://github.com/rust-lang/rust/pull/38927

[39048]: https://github.com/rust-lang/rust/pull/39048

[39282]: https://github.com/rust-lang/rust/pull/39282

[39379]: https://github.com/rust-lang/rust/pull/39379

[41105]: https://github.com/rust-lang/rust/issues/41105

[<*const T>::wrapping_offset]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset

[<*mut T>::wrapping_offset]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset-1

[Duration::checked_add]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add

[Duration::checked_div]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div

[Duration::checked_mul]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul

[Duration::checked_sub]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub

[File::set_permissions]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions

[IpAddr::is_ipv4]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4

[IpAddr::is_ipv6]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6

[Result::unwrap_or_default]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default

[SocketAddr::is_ipv4]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4

[SocketAddr::is_ipv6]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6

[String::insert_str]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str

[String::split_off]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off

[Vec::dedup_by_key]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key

[Vec::dedup_by]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by

[VecDeque::resize]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize

[VecDeque::truncate]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate

[str::repeat]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat

[str::replacen]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen

[cargo/3296]: https://github.com/rust-lang/cargo/pull/3296

[cargo/3301]: https://github.com/rust-lang/cargo/pull/3301

[cargo/3443]: https://github.com/rust-lang/cargo/pull/3443

[cargo/3511]: https://github.com/rust-lang/cargo/pull/3511

[cargo/3515]: https://github.com/rust-lang/cargo/pull/3515

[cargo/3534]: https://github.com/rust-lang/cargo/pull/3534

[cargo/3546]: https://github.com/rust-lang/cargo/pull/3546

[cargo/3557]: https://github.com/rust-lang/cargo/pull/3557

[cargo/3604]: https://github.com/rust-lang/cargo/pull/3604