8f80109c90
Version 1.40.0 (2019-12-19)
===========================
Language
--------
- [You can now use tuple `struct`s and tuple `enum` variant's constructors in
`const` contexts.][65188] e.g.
```rust
pub struct Point(i32, i32);
const ORIGIN: Point = {
let constructor = Point;
constructor(0, 0)
};
```
- [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
indicate that there may be variants or fields added in the future.][64639]
For example this requires adding a wild-card branch (`_ => {}`) to any match
statements on a non-exhaustive `enum`. [(RFC 2008)]
- [You can now use function-like procedural macros in `extern` blocks and in
type positions.][63931] e.g. `type Generated = macro!();`
- [Function-like and attribute procedural macros can now emit
`macro_rules!` items, so you can now have your macros generate macros.][64035]
- [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
`#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
Compiler
--------
- [Added tier 3 support\* for the
`thumbv7neon-unknown-linux-musleabihf` target.][66103]
- [Added tier 3 support for the
`aarch64-unknown-none-softfloat` target.][64589]
- [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
`mips64el-unknown-linux-muslabi64` targets.][65843]
\* Refer to Rust's [platform support page][forge-platform-support] for more
information on Rust's tiered platform support.
Libraries
---------
- [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
Stabilized APIs
---------------
- [`BTreeMap::get_key_value`]
- [`HashMap::get_key_value`]
- [`Option::as_deref_mut`]
- [`Option::as_deref`]
- [`Option::flatten`]
- [`UdpSocket::peer_addr`]
- [`f32::to_be_bytes`]
- [`f32::to_le_bytes`]
- [`f32::to_ne_bytes`]
- [`f64::to_be_bytes`]
- [`f64::to_le_bytes`]
- [`f64::to_ne_bytes`]
- [`f32::from_be_bytes`]
- [`f32::from_le_bytes`]
- [`f32::from_ne_bytes`]
- [`f64::from_be_bytes`]
- [`f64::from_le_bytes`]
- [`f64::from_ne_bytes`]
- [`mem::take`]
- [`slice::repeat`]
- [`todo!`]
Cargo
-----
- [Cargo will now always display warnings, rather than only on
fresh builds.][cargo/7450]
- [Feature flags (except `--all-features`) passed to a virtual workspace will
now produce an error.][cargo/7507] Previously these flags were ignored.
- [You can now publish `dev-dependencies` without including
a `version`.][cargo/7333]
Misc
----
- [You can now specify the `#[cfg(doctest)]` attribute to include an item only
when running documentation tests with `rustdoc`.][63803]
Compatibility Notes
-------------------
- [As previously announced, any previous NLL warnings in the 2015 edition are
now hard errors.][64221]
- [The `include!` macro will now warn if it failed to include the
entire file.][64284] The `include!` macro unintentionally only includes the
first _expression_ in a file, and this can be unintuitive. This will become
either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
- [Using `#[inline]` on function prototypes and consts now emits a warning under
`unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
or `extern` blocks now correctly emits a hard error.
[65294]: https://github.com/rust-lang/rust/pull/65294/
[66103]: https://github.com/rust-lang/rust/pull/66103/
[65843]: https://github.com/rust-lang/rust/pull/65843/
[65188]: https://github.com/rust-lang/rust/pull/65188/
[65092]: https://github.com/rust-lang/rust/pull/65092/
[64589]: https://github.com/rust-lang/rust/pull/64589/
[64639]: https://github.com/rust-lang/rust/pull/64639/
[64221]: https://github.com/rust-lang/rust/pull/64221/
[64284]: https://github.com/rust-lang/rust/pull/64284/
[63931]: https://github.com/rust-lang/rust/pull/63931/
[64035]: https://github.com/rust-lang/rust/pull/64035/
[63674]: https://github.com/rust-lang/rust/pull/63674/
[63803]: https://github.com/rust-lang/rust/pull/63803/
[cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
[cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
[cargo/7525]: https://github.com/rust-lang/cargo/pull/7525/
[cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
[(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
[`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
[`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
[`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
[`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
[`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
[`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
[`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
[`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
[`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
[`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
[`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
[`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
[`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
[`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
[`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
[`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
[`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
[`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
[`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
[`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
[`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
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| .. | ||
| patch-src_bootstrap_bootstrap.py | ||
| patch-src_bootstrap_builder.rs | ||
| patch-src_bootstrap_lib.rs | ||
| patch-src_build__helper_lib.rs | ||
| patch-src_librustc__codegen__ssa_back_linker.rs | ||
| patch-src_librustc__llvm_build.rs | ||
| patch-src_librustc__target_spec_solaris__base.rs | ||
| patch-src_librustc__target_spec_x86__64__sun__solaris.rs | ||
| patch-src_libstd_build.rs | ||
| patch-src_libstd_sys_unix_thread.rs | ||
| patch-src_libunwind_build.rs | ||
| patch-src_llvm-project_llvm_cmake_modules_AddLLVM.cmake | ||
| patch-src_llvm-project_llvm_CMakeLists.txt | ||
| patch-src_llvm-project_llvm_include_llvm-c_DataTypes.h | ||
| patch-src_llvm-project_llvm_include_llvm_Analysis_ConstantFolding.h | ||
| patch-src_llvm-project_llvm_utils_FileCheck_FileCheck.cpp | ||
| patch-src_tools_cargo_src_cargo_core_profiles.rs | ||
| patch-src_tools_cargo_tests_testsuite_build.rs | ||
| patch-src_tools_rls_rls_src_cmd.rs | ||
| patch-src_tools_rls_rls_src_server_io.rs | ||
| patch-src_tools_rust-installer_install-template.sh | ||
| patch-src_vendor_rand-0.6.1_src_rngs_os.rs | ||
| patch-vendor_backtrace-sys_src_libbacktrace_configure | ||
| patch-vendor_libc_src_unix_solarish_mod.rs | ||
| patch-vendor_lzma-sys_config.h | ||
| patch-vendor_rand__os_src_netbsd.rs | ||