Rollup merge of #78364 - XAMPPRocky:relnote-1.48.0, r=pietroalbini
Update RELEASES.md for 1.48.0 ### [Rendered](https://github.com/XAMPPRocky/rust/blob/relnote-1.48.0/RELEASES.md) r? `@Mark-Simulacrum` cc `@rust-lang/release`
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RELEASES.md
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RELEASES.md
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Version 1.48.0 (2020-11-19)
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==========================
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Language
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--------
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- [The `unsafe` keyword is now syntactically permitted on modules.][75857] This
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is still rejected *semantically*, but can now be parsed by procedural macros.
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Compiler
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--------
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- [Stabilised the `-C link-self-contained=<yes|no>` compiler flag.][76158] This tells
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`rustc` whether to link its own C runtime and libraries or to rely on a external
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linker to find them. (Supported only on `windows-gnu`, `linux-musl`, and `wasi` platforms.)
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- [You can now use `-C target-feature=+crt-static` on `linux-gnu` targets.][77386]
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Note: If you're using cargo you must explicitly pass the `--target` flag.
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- [Added tier 2\* support for `aarch64-unknown-linux-musl`.][76420]
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\* Refer to Rust's [platform support page][forge-platform-support] for more
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information on Rust's tiered platform support.
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Libraries
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---------
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- [`io::Write` is now implemented for `&ChildStdin` `&Sink`, `&Stdout`,
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and `&Stderr`.][76275]
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- [All arrays of any length now implement `TryFrom<Vec<T>>`.][76310]
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- [The `matches!` macro now supports having a trailing comma.][74880]
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- [`Vec<A>` now implements `PartialEq<[B]>` where `A: PartialEq<B>`.][74194]
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- [The `RefCell::{replace, replace_with, clone}` methods now all use `#[track_caller]`.][77055]
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Stabilized APIs
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---------------
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- [`slice::as_ptr_range`]
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- [`slice::as_mut_ptr_range`]
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- [`VecDeque::make_contiguous`]
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- [`future::pending`]
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- [`future::ready`]
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The following previously stable methods are now `const fn`'s:
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- [`Option::is_some`]
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- [`Option::is_none`]
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- [`Option::as_ref`]
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- [`Result::is_ok`]
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- [`Result::is_err`]
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- [`Result::as_ref`]
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- [`Ordering::reverse`]
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- [`Ordering::then`]
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Cargo
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-----
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Rustdoc
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-------
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- [You can now link to items in `rustdoc` using the intra-doc link
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syntax.][74430] E.g. ``/// Uses [`std::future`]`` will automatically generate
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a link to `std::future`'s documentation. See ["Linking to items by
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name"][intradoc-links] for more information.
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- [You can now specify `#[doc(alias = "<alias>")]` on items to add search aliases
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when searching through `rustdoc`'s UI.][75740]
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Compatibility Notes
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-------------------
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- [Promotion of references to `'static` lifetime inside `const fn` now follows the
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same rules as inside a `fn` body.][75502] In particular, `&foo()` will not be
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promoted to `'static` lifetime any more inside `const fn`s.
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- [Associated type bindings on trait objects are now verified to meet the bounds
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declared on the trait when checking that they implement the trait.][27675]
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- [When trait bounds on associated types or opaque types are ambiguous, the
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compiler no longer makes an arbitrary choice on which bound to use.][54121]
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- [Fixed recursive nonterminals not being expanded in macros during
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pretty-print/reparse check.][77153] This may cause errors if your macro wasn't
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correctly handling recursive nonterminal tokens.
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- [`&mut` references to non zero-sized types are no longer promoted.][75585]
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- [`rustc` will now warn if you use attributes like `#[link_name]` or `#[cold]`
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in places where they have no effect.][73461]
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- [Updated `_mm256_extract_epi8` and `_mm256_extract_epi16` signatures in
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`arch::{x86, x86_64}` to return `i32` to match the vendor signatures.][73166]
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- [`mem::uninitialized` will now panic if any inner types inside a struct or enum
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disallow zero-initialization.][71274]
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- [`#[target_feature]` will now error if used in a place where it has no effect.][78143]
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- [Foreign exceptions are now caught by `catch_unwind` and will cause an abort.][70212]
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Note: This behaviour is not guaranteed and is still considered undefined behaviour,
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see the [`catch_unwind`] documentation for further information.
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Internal Only
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-------------
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These changes provide no direct user facing benefits, but represent significant
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improvements to the internals and overall performance of rustc and
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related tools.
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- [Building `rustc` from source now uses `ninja` by default over `make`.][74922]
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You can continue building with `make` by setting `ninja=false` in
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your `config.toml`.
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- [cg_llvm: `fewer_names` in `uncached_llvm_type`][76030]
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- [Made `ensure_sufficient_stack()` non-generic][76680]
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[78143]: https://github.com/rust-lang/rust/issues/78143
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[76680]: https://github.com/rust-lang/rust/pull/76680/
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[76030]: https://github.com/rust-lang/rust/pull/76030/
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[70212]: https://github.com/rust-lang/rust/pull/70212/
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[27675]: https://github.com/rust-lang/rust/issues/27675/
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[54121]: https://github.com/rust-lang/rust/issues/54121/
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[71274]: https://github.com/rust-lang/rust/pull/71274/
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[77386]: https://github.com/rust-lang/rust/pull/77386/
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[77153]: https://github.com/rust-lang/rust/pull/77153/
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[77055]: https://github.com/rust-lang/rust/pull/77055/
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[76275]: https://github.com/rust-lang/rust/pull/76275/
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[76310]: https://github.com/rust-lang/rust/pull/76310/
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[76420]: https://github.com/rust-lang/rust/pull/76420/
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[76158]: https://github.com/rust-lang/rust/pull/76158/
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[75857]: https://github.com/rust-lang/rust/pull/75857/
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[75585]: https://github.com/rust-lang/rust/pull/75585/
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[75740]: https://github.com/rust-lang/rust/pull/75740/
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[75502]: https://github.com/rust-lang/rust/pull/75502/
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[74880]: https://github.com/rust-lang/rust/pull/74880/
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[74922]: https://github.com/rust-lang/rust/pull/74922/
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[74430]: https://github.com/rust-lang/rust/pull/74430/
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[74194]: https://github.com/rust-lang/rust/pull/74194/
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[73461]: https://github.com/rust-lang/rust/pull/73461/
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[73166]: https://github.com/rust-lang/rust/pull/73166/
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[intradoc-links]: https://doc.rust-lang.org/rustdoc/linking-to-items-by-name.html
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[`catch_unwind`]: https://doc.rust-lang.org/std/panic/fn.catch_unwind.html
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[`Option::is_some`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_some
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[`Option::is_none`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_none
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[`Option::as_ref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_ref
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[`Result::is_ok`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_ok
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[`Result::is_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_err
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[`Result::as_ref`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.as_ref
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[`Ordering::reverse`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.reverse
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[`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
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[`slice::as_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr_range
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[`slice::as_mut_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_mut_ptr_range
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[`VecDeque::make_contiguous`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.make_contiguous
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[`future::pending`]: https://doc.rust-lang.org/std/future/fn.pending.html
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[`future::ready`]: https://doc.rust-lang.org/std/future/fn.ready.html
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Version 1.47.0 (2020-10-08)
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==========================
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@ -90,6 +230,7 @@ Compatibility Notes
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Internal Only
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--------
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- [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.
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[1.47.0-cfg]: https://docs.microsoft.com/en-us/windows/win32/secbp/control-flow-guard
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