X-Git-Url: https://git.lizzy.rs/?a=blobdiff_plain;f=RELEASES.md;h=9fd796fd775bf995f9d8a624704a36f1bbbabe7d;hb=6142bf6bd91cff38e4067e513813705e5e90ceb7;hp=c9ff49287637d827000569a4a965a147b25b7627;hpb=2967e58be38ce88c65276d160ff8f0dcd13738ca;p=rust.git diff --git a/RELEASES.md b/RELEASES.md index c9ff4928763..9fd796fd775 100644 --- a/RELEASES.md +++ b/RELEASES.md @@ -1,3 +1,143 @@ +Version 1.48.0 (2020-11-19) +========================== + +Language +-------- + +- [The `unsafe` keyword is now syntactically permitted on modules.][75857] This + is still rejected *semantically*, but can now be parsed by procedural macros. + +Compiler +-------- +- [Stabilised the `-C link-self-contained=` compiler flag.][76158] This tells + `rustc` whether to link its own C runtime and libraries or to rely on a external + linker to find them. (Supported only on `windows-gnu`, `linux-musl`, and `wasi` platforms.) +- [You can now use `-C target-feature=+crt-static` on `linux-gnu` targets.][77386] + Note: If you're using cargo you must explicitly pass the `--target` flag. +- [Added tier 2\* support for `aarch64-unknown-linux-musl`.][76420] + +\* Refer to Rust's [platform support page][forge-platform-support] for more +information on Rust's tiered platform support. + +Libraries +--------- +- [`io::Write` is now implemented for `&ChildStdin` `&Sink`, `&Stdout`, + and `&Stderr`.][76275] +- [All arrays of any length now implement `TryFrom>`.][76310] +- [The `matches!` macro now supports having a trailing comma.][74880] +- [`Vec` now implements `PartialEq<[B]>` where `A: PartialEq`.][74194] +- [The `RefCell::{replace, replace_with, clone}` methods now all use `#[track_caller]`.][77055] + +Stabilized APIs +--------------- +- [`slice::as_ptr_range`] +- [`slice::as_mut_ptr_range`] +- [`VecDeque::make_contiguous`] +- [`future::pending`] +- [`future::ready`] + +The following previously stable methods are now `const fn`'s: + +- [`Option::is_some`] +- [`Option::is_none`] +- [`Option::as_ref`] +- [`Result::is_ok`] +- [`Result::is_err`] +- [`Result::as_ref`] +- [`Ordering::reverse`] +- [`Ordering::then`] + +Cargo +----- + +Rustdoc +------- +- [You can now link to items in `rustdoc` using the intra-doc link + syntax.][74430] E.g. ``/// Uses [`std::future`]`` will automatically generate + a link to `std::future`'s documentation. See ["Linking to items by + name"][intradoc-links] for more information. +- [You can now specify `#[doc(alias = "")]` on items to add search aliases + when searching through `rustdoc`'s UI.][75740] + +Compatibility Notes +------------------- +- [Promotion of references to `'static` lifetime inside `const fn` now follows the + same rules as inside a `fn` body.][75502] In particular, `&foo()` will not be + promoted to `'static` lifetime any more inside `const fn`s. +- [Associated type bindings on trait objects are now verified to meet the bounds + declared on the trait when checking that they implement the trait.][27675] +- [When trait bounds on associated types or opaque types are ambiguous, the + compiler no longer makes an arbitrary choice on which bound to use.][54121] +- [Fixed recursive nonterminals not being expanded in macros during + pretty-print/reparse check.][77153] This may cause errors if your macro wasn't + correctly handling recursive nonterminal tokens. +- [`&mut` references to non zero-sized types are no longer promoted.][75585] +- [`rustc` will now warn if you use attributes like `#[link_name]` or `#[cold]` + in places where they have no effect.][73461] +- [Updated `_mm256_extract_epi8` and `_mm256_extract_epi16` signatures in + `arch::{x86, x86_64}` to return `i32` to match the vendor signatures.][73166] +- [`mem::uninitialized` will now panic if any inner types inside a struct or enum + disallow zero-initialization.][71274] +- [`#[target_feature]` will now error if used in a place where it has no effect.][78143] +- [Foreign exceptions are now caught by `catch_unwind` and will cause an abort.][70212] + Note: This behaviour is not guaranteed and is still considered undefined behaviour, + see the [`catch_unwind`] documentation for further information. + + + +Internal Only +------------- +These changes provide no direct user facing benefits, but represent significant +improvements to the internals and overall performance of rustc and +related tools. + +- [Building `rustc` from source now uses `ninja` by default over `make`.][74922] + You can continue building with `make` by setting `ninja=false` in + your `config.toml`. +- [cg_llvm: `fewer_names` in `uncached_llvm_type`][76030] +- [Made `ensure_sufficient_stack()` non-generic][76680] + +[78143]: https://github.com/rust-lang/rust/issues/78143 +[76680]: https://github.com/rust-lang/rust/pull/76680/ +[76030]: https://github.com/rust-lang/rust/pull/76030/ +[70212]: https://github.com/rust-lang/rust/pull/70212/ +[27675]: https://github.com/rust-lang/rust/issues/27675/ +[54121]: https://github.com/rust-lang/rust/issues/54121/ +[71274]: https://github.com/rust-lang/rust/pull/71274/ +[77386]: https://github.com/rust-lang/rust/pull/77386/ +[77153]: https://github.com/rust-lang/rust/pull/77153/ +[77055]: https://github.com/rust-lang/rust/pull/77055/ +[76275]: https://github.com/rust-lang/rust/pull/76275/ +[76310]: https://github.com/rust-lang/rust/pull/76310/ +[76420]: https://github.com/rust-lang/rust/pull/76420/ +[76158]: https://github.com/rust-lang/rust/pull/76158/ +[75857]: https://github.com/rust-lang/rust/pull/75857/ +[75585]: https://github.com/rust-lang/rust/pull/75585/ +[75740]: https://github.com/rust-lang/rust/pull/75740/ +[75502]: https://github.com/rust-lang/rust/pull/75502/ +[74880]: https://github.com/rust-lang/rust/pull/74880/ +[74922]: https://github.com/rust-lang/rust/pull/74922/ +[74430]: https://github.com/rust-lang/rust/pull/74430/ +[74194]: https://github.com/rust-lang/rust/pull/74194/ +[73461]: https://github.com/rust-lang/rust/pull/73461/ +[73166]: https://github.com/rust-lang/rust/pull/73166/ +[intradoc-links]: https://doc.rust-lang.org/rustdoc/linking-to-items-by-name.html +[`catch_unwind`]: https://doc.rust-lang.org/std/panic/fn.catch_unwind.html +[`Option::is_some`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_some +[`Option::is_none`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_none +[`Option::as_ref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_ref +[`Result::is_ok`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_ok +[`Result::is_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_err +[`Result::as_ref`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.as_ref +[`Ordering::reverse`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.reverse +[`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then +[`slice::as_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr_range +[`slice::as_mut_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_mut_ptr_range +[`VecDeque::make_contiguous`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.make_contiguous +[`future::pending`]: https://doc.rust-lang.org/std/future/fn.pending.html +[`future::ready`]: https://doc.rust-lang.org/std/future/fn.ready.html + + Version 1.47.0 (2020-10-08) ========================== @@ -90,6 +230,7 @@ Compatibility Notes Internal Only -------- + - [Improved default settings for bootstrapping in `x.py`.][73964] You can read details about this change in the ["Changes to `x.py` defaults"](https://blog.rust-lang.org/inside-rust/2020/08/30/changes-to-x-py-defaults.html) post on the Inside Rust blog. [1.47.0-cfg]: https://docs.microsoft.com/en-us/windows/win32/secbp/control-flow-guard