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Update RELEASES.md for 1.50.0 #80812

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Update RELEASES.md for 1.50.0 #80812

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120 changes: 120 additions & 0 deletions RELEASES.md
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Version 1.50.0 (2021-02-11)
============================

Language
-----------------------
- [You can now use `const` values for `x` in `[x; N]` array expressions.][79270]
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Note that "const values" is not exactly right, depending on interpretation. [Vec::<i32>::new(); 10] is not accepted. It only works for actual constants, not values/expressions that are (or can be) const: e.g. [EMPTY; 10] with const EMPTY: Vec<i32> = Vec::new();.

This has been technically possible since 1.38.0, as it was unintentionally stabilized.
- [Assignments to `ManuallyDrop<T>` union fields are now considered safe.][78068]

Compiler
-----------------------
- [Added tier 3\* support for the `armv5te-unknown-linux-uclibceabi` target.][78142]
- [Added tier 3 support for the `aarch64-apple-ios-macabi` target.][77484]
- [The `x86_64-unknown-freebsd` is now built with the full toolset.][79484]

\* Refer to Rust's [platform support page][forge-platform-support] for more
information on Rust's tiered platform support.

Libraries
-----------------------

- [`proc_macro::Punct` now implements `PartialEq<char>`.][78636]
- [`ops::{Index, IndexMut}` are now implemented for fixed sized arrays of any length.][74989]
- [On Unix platforms, the `std::fs::File` type now has a "niche" of `-1`.][74699]
This value cannot be a valid file descriptor, and now means `Option<File>` takes
up the same amount of space as `File`.

Stabilized APIs
---------------

- [`bool::then`]
- [`btree_map::Entry::or_insert_with_key`]
- [`f32::clamp`]
- [`f64::clamp`]
- [`hash_map::Entry::or_insert_with_key`]
- [`Ord::clamp`]
- [`RefCell::take`]
- [`slice::fill`]
- [`UnsafeCell::get_mut`]

The following previously stable methods are now `const`.

- [`IpAddr::is_ipv4`]
- [`IpAddr::is_ipv6`]
- [`Layout::size`]
- [`Layout::align`]
- [`Layout::from_size_align`]
- `pow` for all integer types.
- `checked_pow` for all integer types.
- `saturating_pow` for all integer types.
- `wrapping_pow` for all integer types.
- `next_power_of_two` for all unsigned integer types.
- `checked_power_of_two` for all unsigned integer types.

Cargo
-----------------------

- [Added the `[build.rustc-workspace-wrapper]` option.][cargo/8976]
This option sets a wrapper to execute instead of `rustc`, for workspace members only.
- [`cargo:rerun-if-changed` will now, if provided a directory, scan the entire
contents of that directory for changes.][cargo/8973]
- [Added the `--workspace` flag to the `cargo update` command.][cargo/8725]

Misc
----

- [The search results tab and the help button are focusable with keyboard in rustdoc.][79896]
- [Running tests will now print the total time taken to execute.][75752]

Compatibility Notes
-------------------

- [The `compare_and_swap` method on atomics has been deprecated.][79261] It's
recommended to use the `compare_exchange` and `compare_exchange_weak` methods instead.
- [Changes in how `TokenStream`s are checked have fixed some cases where you could write
unhygenic `macro_rules!` macros.][79472]
- [`#![test]` as an inner attribute is now considered unstable like other inner macro
attributes, and reports an error by default through the `soft_unstable` lint.][79003]
- [Overriding a `forbid` lint at the same level that it was set is now a hard error.][78864]
- [Dropped support for all cloudabi targets.][78439]
- [You can no longer intercept `panic!` calls by supplying your own macro.][78343] It's
recommended to use the `#[panic_handler]` attribute to provide your own implementation.
- [Semi-colons after item statements (e.g. `struct Foo {};`) now produce a warning.][78296]

[74989]: https://github.com/rust-lang/rust/pull/74989
[79261]: https://github.com/rust-lang/rust/pull/79261
[79896]: https://github.com/rust-lang/rust/pull/79896
[79484]: https://github.com/rust-lang/rust/pull/79484
[79472]: https://github.com/rust-lang/rust/pull/79472
[79270]: https://github.com/rust-lang/rust/pull/79270
[79003]: https://github.com/rust-lang/rust/pull/79003
[78864]: https://github.com/rust-lang/rust/pull/78864
[78636]: https://github.com/rust-lang/rust/pull/78636
[78439]: https://github.com/rust-lang/rust/pull/78439
[78343]: https://github.com/rust-lang/rust/pull/78343
[78296]: https://github.com/rust-lang/rust/pull/78296
[78068]: https://github.com/rust-lang/rust/pull/78068
[75752]: https://github.com/rust-lang/rust/pull/75752
[74699]: https://github.com/rust-lang/rust/pull/74699
[78142]: https://github.com/rust-lang/rust/pull/78142
[77484]: https://github.com/rust-lang/rust/pull/77484
[cargo/8976]: https://github.com/rust-lang/cargo/pull/8976
[cargo/8973]: https://github.com/rust-lang/cargo/pull/8973
[cargo/8725]: https://github.com/rust-lang/cargo/pull/8725
[`IpAddr::is_ipv4`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv4
[`IpAddr::is_ipv6`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv6
[`Layout::align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.align
[`Layout::from_size_align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.from_size_align
[`Layout::size`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.size
[`Ord::clamp`]: https://doc.rust-lang.org/stable/std/cmp/trait.Ord.html#method.clamp
[`RefCell::take`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.take
[`UnsafeCell::get_mut`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.get_mut
[`bool::then`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then
[`btree_map::Entry::or_insert_with_key`]: https://doc.rust-lang.org/stable/std/collections/btree_map/enum.Entry.html#method.or_insert_with_key
[`f32::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.clamp
[`f64::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.clamp
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[`hash_map::Entry::or_insert_with_key`]: https://doc.rust-lang.org/stable/std/collections/hash_map/enum.Entry.html#method.or_insert_with_key
[`slice::fill`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.fill


Version 1.49.0 (2020-12-31)
============================

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