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`
rust-lang · Nov 16, 2020 · c75f210 · c75f210
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 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=<yes|no>` 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<Vec<T>>`.][76310]
 - [The `matches!` macro now supports having a trailing comma.][74880]
 - [`Vec<A>` now implements `PartialEq<[B]>` where `A: PartialEq<B>`.][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 = "<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