+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)
==========================
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
- [Added the `tiny` value to the `code-model` codegen flag.][72397]
- [Added tier 3 support\* for the `mipsel-sony-psp` target.][72062]
- [Added tier 3 support for the `thumbv7a-uwp-windows-msvc` target.][72133]
+- [Upgraded to LLVM 10.][67759]
\* Refer to Rust's [platform support page][forge-platform-support] for more
information on Rust's tiered platform support.
[72062]: https://github.com/rust-lang/rust/pull/72062/
[72094]: https://github.com/rust-lang/rust/pull/72094/
[72133]: https://github.com/rust-lang/rust/pull/72133/
+[67759]: https://github.com/rust-lang/rust/pull/67759/
[71900]: https://github.com/rust-lang/rust/pull/71900/
[71928]: https://github.com/rust-lang/rust/pull/71928/
[71662]: https://github.com/rust-lang/rust/pull/71662/
`armv7-unknown-linux-musleabi` targets.][63107]
- [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
- [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
+- [Upgraded to LLVM 9.][62592]
\* Refer to Rust's [platform support page][forge-platform-support] for more
information on Rust's tiered platform support.
[62735]: https://github.com/rust-lang/rust/pull/62735/
[62766]: https://github.com/rust-lang/rust/pull/62766/
[62784]: https://github.com/rust-lang/rust/pull/62784/
+[62592]: https://github.com/rust-lang/rust/pull/62592/
[62785]: https://github.com/rust-lang/rust/issues/62785/
[62814]: https://github.com/rust-lang/rust/pull/62814/
[62896]: https://github.com/rust-lang/rust/issues/62896/
--------
- [Added the `riscv32imc-unknown-none-elf` target.][53822]
- [Added the `aarch64-unknown-netbsd` target][53165]
+- [Upgraded to LLVM 8.][53611]
Libraries
---------
[53033]: https://github.com/rust-lang/rust/pull/53033/
[53044]: https://github.com/rust-lang/rust/pull/53044/
[53165]: https://github.com/rust-lang/rust/pull/53165/
+[53611]: https://github.com/rust-lang/rust/pull/53611/
[53213]: https://github.com/rust-lang/rust/pull/53213/
[53236]: https://github.com/rust-lang/rust/pull/53236/
[53272]: https://github.com/rust-lang/rust/pull/53272/
- [Bumped minimum LLVM version to 5.0.][51899]
- [Added `powerpc64le-unknown-linux-musl` target.][51619]
- [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
+- [Upgraded to LLVM 7.][51966]
Libraries
---------
[53893]: https://github.com/rust-lang/rust/pull/53893/
[52861]: https://github.com/rust-lang/rust/pull/52861/
+[51966]: https://github.com/rust-lang/rust/pull/51966/
[52656]: https://github.com/rust-lang/rust/pull/52656/
[52239]: https://github.com/rust-lang/rust/pull/52239/
[52330]: https://github.com/rust-lang/rust/pull/52330/
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