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1.15 release notes
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Brian Anderson
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RELEASES.md
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RELEASES.md
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Version 1.15.0 (2017-02-02)
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===========================
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Language
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--------
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* Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
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stable. This allows popular code-generating crates like Serde and Diesel to
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work ergonomically. [RFC 1681].
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* [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
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with curly braces][36868]. Part of [RFC 1506].
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* [A number of minor changes to name resolution have been activated][37127].
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They add up to more consistent semantics, allowing for future evolution of
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Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
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details of what is different. The breaking changes here have been transitioned
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through the [`legacy_imports`] lint since 1.14, with no known regressions.
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* [In `macro_rules`, `path` fragments can now be parsed as type parameter
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bounds][38279]
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* [`?Sized` can be used in `where` clauses][37791]
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* [There is now a limit on the size of monomorphized types and it can be
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modified with the `#![type_size_limit]` crate attribute, similarly to
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the `#![recursion_limit]` attribute][37789]
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Compiler
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--------
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* [On Windows, the compiler will apply dllimport attributes when linking to
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extern functions][37973]. Additional attributes and flags can control which
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library kind is linked and its name. [RFC 1717].
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* [Rust-ABI symbols are no longer exported from cdylibs][38117]
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* [The `--test` flag works with procedural macro crates][38107]
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* [Fix `extern "aapcs" fn` ABI][37814]
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* [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
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* [The `format!` expander recognizes incorrect `printf` and shell-style
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formatting directives and suggests the correct format][37613].
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* [Only report one error for all unused imports in an import list][37456]
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Compiler Performance
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--------------------
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* [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
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* [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
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* [Don't clone in `UnificationTable::probe`][37848]
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* [Remove `scope_auxiliary` to cut RSS by 10%][37764]
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* [Use small vectors in type walker][37760]
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* [Macro expansion performance was improved][37701]
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* [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
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* [Replace FNV with a faster hash function][37229]
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Stabilized APIs
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---------------
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* [`std::iter::Iterator::min_by`]
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* [`std::iter::Iterator::max_by`]
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* [`std::os::*::fs::FileExt`]
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* [`std::sync::atomic::Atomic*::get_mut`]
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* [`std::sync::atomic::Atomic*::into_inner`]
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* [`std::vec::IntoIter::as_slice`]
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* [`std::vec::IntoIter::as_mut_slice`]
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* [`std::sync::mpsc::Receiver::try_iter`]
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* [`std::os::unix::process::CommandExt::before_exec`]
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* [`std::rc::Rc::strong_count`]
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* [`std::rc::Rc::weak_count`]
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* [`std::sync::Arc::strong_count`]
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* [`std::sync::Arc::weak_count`]
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* [`std::char::encode_utf8`]
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* [`std::char::encode_utf16`]
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* [`std::cell::Ref::clone`]
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* [`std::io::Take::into_inner`]
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Libraries
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---------
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* [The standard sorting algorithm has been rewritten for dramatic performance
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improvements][38192]. It is a hybrid merge sort, drawing influences from
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Timsort. Previously it was a naive merge sort.
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* [`Iterator::nth` no longer has a `Sized` bound][38134]
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* [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
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performance.
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* [`chars().count()` is much faster][37888] and so are [`chars().last()`
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and `char_indices().last()`][37882]
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* [Fix ARM Objective-C ABI in `std::env::args`][38146]
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* [Chinese characters display correctly in `fmt::Debug`][37855]
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* [Derive `Default` for `Duration`][37699]
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* [Support creation of anonymous pipes on WinXP/2k][37677]
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* [`mpsc::RecvTimeoutError` implements `Error`][37527]
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* [Don't pass overlapped handles to processes][38835]
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Cargo
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-----
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* [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
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environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
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should instead check the variable at runtime with `std::env`. That the value
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was set at build time was a bug, and incorrect when cross-compiling. This
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change is known to cause breakage.
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* [Add `--all` flag to `cargo test`][cargo/3221]
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* [Compile statically against the MSVC CRT][cargo/3363]
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* [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
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* [Link OpenSSL statically on OSX][cargo/3311]
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* [Apply new fingerprinting to build dir outputs][cargo/3310]
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* [Test for bad path overrides with summaries][cargo/3336]
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* [Require `cargo install --vers` to take a semver version][cargo/3338]
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* [Fix retrying crate downloads for network errors][cargo/3348]
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* [Implement string lookup for `build.rustflags` config key][cargo/3356]
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* [Emit more info on --message-format=json][cargo/3319]
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* [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
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* [Don't ignore errors in workspace manifest][cargo/3409]
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* [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
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Tooling
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-------
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* [Test runners (binaries built with `--test`) now support a `--list` argument
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that lists the tests it contains][38185]
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* [Test runners now support a `--exact` argument that makes the test filter
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match exactly, instead of matching only a substring of the test name][38181]
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* [rustdoc supports a `--playground-url` flag][37763]
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* [rustdoc provides more details about `#[should_panic]` errors][37749]
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Misc
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----
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* [The Rust build system is now written in Rust][37817]. The Makefiles may
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continue to be used in this release by passing `--disable-rustbuild` to the
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configure script, but they will be deleted soon. Note that the new build
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system uses a different on-disk layout that will likely affect any scripts
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building Rust.
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* [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
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releases.
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* [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
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* [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
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releases.
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Compatibility Notes
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-------------------
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* [A number of minor changes to name resolution have been activated][37127].
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They add up to more consistent semantics, allowing for future evolution of
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Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
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details of what is different. The breaking changes here have been transitioned
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through the [`legacy_imports`] lint since 1.14, with no known regressions.
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* [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
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environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
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should instead check the variable at runtime with `std::env`. That the value
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was set at build time was a bug, and incorrect when cross-compiling. This
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change is known to cause breakage.
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* [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
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types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
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1.10 and is now an error by default. It will become a hard error in the near
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future.
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* [The semantics relating modules to file system directories are changing in
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minor ways][37602]. This is captured in the new `legacy_directory_ownership`
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lint, which is a warning in this release, and will become a hard error in the
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future.
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* [Rust-ABI symbols are no longer exported from cdylibs][38117]
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* [Once `Peekable` peeks a `None` it will return that `None` without re-querying
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the underlying iterator][37834]
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["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
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[33685]: https://github.com/rust-lang/rust/issues/33685
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[36868]: https://github.com/rust-lang/rust/pull/36868
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[37127]: https://github.com/rust-lang/rust/pull/37127
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[37229]: https://github.com/rust-lang/rust/pull/37229
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[37456]: https://github.com/rust-lang/rust/pull/37456
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[37527]: https://github.com/rust-lang/rust/pull/37527
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[37602]: https://github.com/rust-lang/rust/pull/37602
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[37613]: https://github.com/rust-lang/rust/pull/37613
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[37615]: https://github.com/rust-lang/rust/pull/37615
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[37636]: https://github.com/rust-lang/rust/pull/37636
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[37642]: https://github.com/rust-lang/rust/pull/37642
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[37677]: https://github.com/rust-lang/rust/pull/37677
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[37699]: https://github.com/rust-lang/rust/pull/37699
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[37701]: https://github.com/rust-lang/rust/pull/37701
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[37705]: https://github.com/rust-lang/rust/pull/37705
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[37749]: https://github.com/rust-lang/rust/pull/37749
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[37760]: https://github.com/rust-lang/rust/pull/37760
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[37763]: https://github.com/rust-lang/rust/pull/37763
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[37764]: https://github.com/rust-lang/rust/pull/37764
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[37789]: https://github.com/rust-lang/rust/pull/37789
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[37791]: https://github.com/rust-lang/rust/pull/37791
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[37814]: https://github.com/rust-lang/rust/pull/37814
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[37817]: https://github.com/rust-lang/rust/pull/37817
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[37834]: https://github.com/rust-lang/rust/pull/37834
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[37848]: https://github.com/rust-lang/rust/pull/37848
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[37855]: https://github.com/rust-lang/rust/pull/37855
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[37882]: https://github.com/rust-lang/rust/pull/37882
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[37888]: https://github.com/rust-lang/rust/pull/37888
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[37973]: https://github.com/rust-lang/rust/pull/37973
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[37979]: https://github.com/rust-lang/rust/pull/37979
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[38086]: https://github.com/rust-lang/rust/pull/38086
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[38107]: https://github.com/rust-lang/rust/pull/38107
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[38117]: https://github.com/rust-lang/rust/pull/38117
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[38134]: https://github.com/rust-lang/rust/pull/38134
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[38146]: https://github.com/rust-lang/rust/pull/38146
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[38181]: https://github.com/rust-lang/rust/pull/38181
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[38182]: https://github.com/rust-lang/rust/pull/38182
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[38185]: https://github.com/rust-lang/rust/pull/38185
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[38192]: https://github.com/rust-lang/rust/pull/38192
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[38279]: https://github.com/rust-lang/rust/pull/38279
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[38835]: https://github.com/rust-lang/rust/pull/38835
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[RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
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[RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
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[RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
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[RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
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[RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
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[`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
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[`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
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[cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
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[cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
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[cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
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[cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
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[cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
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[cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
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[cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
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[cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
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[cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
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[cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
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[cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
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[cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
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[cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
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[cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
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[`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
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[`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
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[`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
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[`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
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[`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
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[`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
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[`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
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[`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
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[`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
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[`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
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[`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
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[`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
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[`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
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[`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
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[`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
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[`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
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[`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
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Version 1.14.0 (2016-12-22)
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===========================
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