Release notes for 1.8 #32810
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| Version 1.8.0 (2016-04-14) | ||
| ========================== | ||
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| Language | ||
| -------- | ||
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| * Rust supports overloading of compound assignment statements like | ||
| `+=` by implementing the [`AddAssign`], [`SubAssign`], | ||
| [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`], | ||
| [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`] | ||
| traits. [RFC 953]. | ||
| * Empty structs can be defined with braces, as in `struct Foo { }`, in | ||
| addition to the non-braced form, `struct Foo;`. [RFC 218]. | ||
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| Libraries | ||
| --------- | ||
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| * Stabilized APIs: | ||
| * [`str::encode_utf16`][] (renamed from `utf16_units`) | ||
| * [`str::EncodeUtf16`][] (renamed from `Utf16Units`) | ||
| * [`Ref::map`] | ||
| * [`RefMut::map`] | ||
| * [`ptr::drop_in_place`] | ||
| * [`time::Instant`] | ||
| * [`time::SystemTime`] | ||
| * [`Instant::now`] | ||
| * [`Instant::duration_since`][] (renamed from `duration_from_earlier`) | ||
| * [`Instant::elapsed`] | ||
| * [`SystemTime::now`] | ||
| * [`SystemTime::duration_since`][] (renamed from `duration_from_earlier`) | ||
| * [`SystemTime::elapsed`] | ||
| * Various `Add`/`Sub` impls for `Time` and `SystemTime` | ||
| * [`SystemTimeError`] | ||
| * [`SystemTimeError::duration`] | ||
| * Various impls for `SystemTimeError` | ||
| * [`UNIX_EPOCH`] | ||
| * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`], | ||
| [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`], | ||
| [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`]. | ||
| * [The `write!` and `writeln!` macros correctly emit errors if any of | ||
| their arguments can't be formatted][1.8w]. | ||
| * [Various I/O functions support large files on 32-bit Linux][1.8l]. | ||
| * [The Unix-specific `raw` modules, which contain a number of | ||
| redefined C types are deprecated][1.8r], including `os::raw::unix`, | ||
| `os::raw::macos`, and `os::raw::linux`. These modules defined types | ||
| such as `ino_t` and `dev_t`. The inconsistency of these definitions | ||
| across platforms was making it difficult to implement `std` | ||
| correctly. Those that need these definitions should use the `libc` | ||
| crate. [RFC 1415]. | ||
| * The Unix-specific `MetadataExt` traits, including | ||
| `os::unix::fs::MetadataExt`, which expose values such as inode | ||
| numbers [no longer return platform-specific types][1.8r], but | ||
| instead return widened integers. [RFC 1415]. | ||
| * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv]. | ||
| * [Atomic loads and stores are not volatile][1.8a]. | ||
| * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp]. | ||
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| Performance | ||
| ----------- | ||
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| * [Inlining hash functions lead to a 3% compile-time improvement in | ||
| some workloads][1.8h]. | ||
| * When using jemalloc, its symbols are [unprefixed so that it | ||
| overrides the libc malloc implementation][1.8h]. This means that for | ||
| rustc, LLVM is now using jemalloc, which results in a 6% | ||
| compile-time improvement on a specific workload. | ||
| * [Avoid quadratic growth in function size due to cleanups][1.8cu]. | ||
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| Misc | ||
| ---- | ||
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| * [32-bit MSVC builds finally implement unwinding][1.8ms]. | ||
| i686-pc-windows-msvc is now considered a tier-1 platform. | ||
| * [The `--print targets` flag prints a list of supported targets][1.8t]. | ||
| * [The `--print cfg` flag prints the `cfg`s defined for the current | ||
| target][1.8cf]. | ||
| * [`rustc` can be built with an new Cargo-based build system, written | ||
|
There was a problem hiding this comment. No idea if this is the right forum to make a comment, but I think this line should be "can be built with a new" not "an new" |
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| in Rust][1.8b]. It will eventually replace Rust's Makefile-based | ||
| build system. To enable it configure with `configure --rustbuild`. | ||
| * [Errors for non-exhaustive `match` patterns now list up to 3 missing | ||
| variants while also indicating the total number of missing variants | ||
| if more than 3][1.8m]. | ||
| * [Executable stacks are disabled on Linux and BSD][1.8nx]. | ||
| * The Rust Project now publishes binary releases of the standard | ||
| library for a number of tier-2 targets: | ||
| `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`, | ||
|
There was a problem hiding this comment. @brson What’s the difference between There was a problem hiding this comment. arm ends up generating armv6 instructions whereas armv7 generates armv7 instructions, but beyond that they should be the same. Unfortunately I don't know about the actual differences between armv6 and armv7 beyond our generated armv7 binaries are generally faster. |
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| `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu` | ||
| `x86_64-rumprun-netbsd`. These can be installed with | ||
| tools such as [multirust][1.8mr]. | ||
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| Cargo | ||
| ----- | ||
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| * [`cargo init` creates a new Cargo project in the current | ||
| directory][1.8ci]. It is otherwise like `cargo new`. | ||
| * [Cargo has configuration keys for `-v` and | ||
|
There was a problem hiding this comment. If I am not mistaken another new subcommand in this release is |
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| `--color`][1.8cc]. `verbose` and `color`, respectively, go in the | ||
| `[term]` section of `.cargo/config`. | ||
| * [Configuration keys that evaluate to strings or integers can be set | ||
| via environment variables][1.8ce]. For example the `build.jobs` key | ||
| can be set via `CARGO_BUILD_JOBS`. Environment variables take | ||
| precedence over config files. | ||
| * [Target-specific dependencies support Rust `cfg` syntax for | ||
| describing targets][1.8cfg] so that dependencies for multiple | ||
| targets can be specified together. [RFC 1361]. | ||
| * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and | ||
| `RUSTDOC` take precedence over the `build.target-dir`, | ||
| `build.rustc`, and `build.rustdoc` configuration values][1.8cv]. | ||
| * [The child process tree is killed on Windows when Cargo is | ||
| killed][1.8ck]. | ||
| * [The `build.target` configuration value sets the target platform, | ||
| like `--target`][1.8ct]. | ||
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| Compatibility Notes | ||
| ------------------- | ||
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| * [Unstable compiler flags have been further restricted][1.8u]. Since | ||
| 1.0 `-Z` flags have been considered unstable, and other flags that | ||
| were considered unstable additionally required passing `-Z | ||
| unstable-options` to access. Unlike unstable language and library | ||
| features though, these options have been accessible on the stable | ||
| release channel. Going forward, *new unstable flags will not be | ||
| available on the stable release channel*, and old unstable flags | ||
| will warn about their usage. In the future, all unstable flags will | ||
| be unavailable on the stable release channel. | ||
| * [It is no longer possible to `match` on empty enum variants using | ||
| the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6. | ||
| * The Unix-specific `MetadataExt` traits, including | ||
| `os::unix::fs::MetadataExt`, which expose values such as inode | ||
| numbers [no longer return platform-specific types][1.8r], but | ||
| instead return widened integers. [RFC 1415]. | ||
| * [Modules sourced from the filesystem cannot appear within arbitrary | ||
| blocks, but only within other modules][1.8m]. | ||
| * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c]. | ||
| * On Unix, [stack overflow triggers a runtime abort instead of a | ||
| SIGSEGV][1.8so]. | ||
| * [`Command::spawn` and its equivalents return an error if any of | ||
| its command-line arguments contain interior `NUL`s][1.8n]. | ||
| * [Tuple and unit enum variants from other crates are in the type | ||
| namespace][1.8tn]. | ||
| * [On Windows `rustc` emits `.lib` files for the `staticlib` library | ||
| type instead of `.a` files][1.8st]. Additionally, for the MSVC | ||
| toolchain, `rustc` emits import libraries named `foo.dll.lib` | ||
| instead of `foo.lib`. | ||
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| [1.8a]: https://github.com/rust-lang/rust/pull/30962 | ||
| [1.8b]: https://github.com/rust-lang/rust/pull/31123 | ||
| [1.8c]: https://github.com/rust-lang/rust/pull/31530 | ||
| [1.8cc]: https://github.com/rust-lang/cargo/pull/2397 | ||
| [1.8ce]: https://github.com/rust-lang/cargo/pull/2398 | ||
| [1.8cf]: https://github.com/rust-lang/rust/pull/31278 | ||
| [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328 | ||
| [1.8ci]: https://github.com/rust-lang/cargo/pull/2081 | ||
| [1.8ck]: https://github.com/rust-lang/cargo/pull/2370 | ||
| [1.8ct]: https://github.com/rust-lang/cargo/pull/2335 | ||
| [1.8cu]: https://github.com/rust-lang/rust/pull/31390 | ||
| [1.8cv]: https://github.com/rust-lang/cargo/issues/2365 | ||
| [1.8cv]: https://github.com/rust-lang/rust/pull/30998 | ||
| [1.8h]: https://github.com/rust-lang/rust/pull/31460 | ||
| [1.8l]: https://github.com/rust-lang/rust/pull/31668 | ||
| [1.8m]: https://github.com/rust-lang/rust/pull/31020 | ||
| [1.8m]: https://github.com/rust-lang/rust/pull/31534 | ||
|
There was a problem hiding this comment. duplicate link label, causing wrong target for one of the links There was a problem hiding this comment. The PR was merged without fixing this, cc @brson |
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| [1.8mp]: https://github.com/rust-lang/rust/pull/30894 | ||
| [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901 | ||
| [1.8ms]: https://github.com/rust-lang/rust/pull/30448 | ||
| [1.8n]: https://github.com/rust-lang/rust/pull/31056 | ||
| [1.8nx]: https://github.com/rust-lang/rust/pull/30859 | ||
| [1.8r]: https://github.com/rust-lang/rust/pull/31551 | ||
| [1.8so]: https://github.com/rust-lang/rust/pull/31333 | ||
| [1.8st]: https://github.com/rust-lang/rust/pull/29520 | ||
| [1.8t]: https://github.com/rust-lang/rust/pull/31358 | ||
| [1.8tn]: https://github.com/rust-lang/rust/pull/30882 | ||
| [1.8u]: https://github.com/rust-lang/rust/pull/31793 | ||
| [1.8v]: https://github.com/rust-lang/rust/pull/31757 | ||
| [1.8w]: https://github.com/rust-lang/rust/pull/31904 | ||
| [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md | ||
| [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md | ||
| [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md | ||
| [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md | ||
| [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html | ||
| [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html | ||
| [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html | ||
| [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html | ||
| [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html | ||
| [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since | ||
| [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed | ||
| [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now | ||
| [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html | ||
| [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map | ||
| [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map | ||
| [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html | ||
| [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html | ||
| [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html | ||
| [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html | ||
| [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since | ||
| [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed | ||
| [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now | ||
| [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration | ||
| [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html | ||
| [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html | ||
| [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html | ||
| [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html | ||
| [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16 | ||
| [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html | ||
| [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html | ||
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| Version 1.7.0 (2016-03-03) | ||
| ========================== | ||
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Seems like there's a missing comma in this sentence, or a disagreement between "exposes" and its subject.
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Good catch