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Updated RELEASES.md for 1.34.0 #59599

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Updated RELEASES.md for 1.34.0 #59599

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Updated RELEASES.md for 1.34.0
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Version 1.34.0 (2019-04-11)
==========================

Language
--------
- [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
`#[deprecated(note = "reason")]`. This was previously allowed by mistake
but had no effect.
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- [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
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`#[attr{}]` procedural macros.][57367]
- [You can now write `extern crate self as foo;`][57407] to import your
crate's root into the extern prelude.


Compiler
--------
- [You can now target `riscv64imac-unknown-none-elf` and
`riscv64gc-unknown-none-elf`.][58406]
- [You can now enable linker plugin LTO optimisations with
`-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
boundaries.
- [You can now target `powerpc64-unknown-freebsd`.][57809]


Libraries
---------
- [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
`HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
the `Hash` trait to create an iterator.
- [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
methods.][58421] Most notably you no longer require the `Ord` trait to create
an iterator.
- [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
for all numeric types.][58044]
- [Indexing a `str` is now generic over all types that
implement `SliceIndex<str>`.][57604]
- [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
`str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
produce a warning if their returning type is unused.
- [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
`overflowing_pow` are now available for all numeric types.][57873] These are
equivalvent to methods such as `wrapping_add` for the `pow` operation.


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

#### std & core
* [`Any::type_id`]
* [`Error::type_id`]
* [`atomic::AtomicI16`]
* [`atomic::AtomicI32`]
* [`atomic::AtomicI64`]
* [`atomic::AtomicI8`]
* [`atomic::AtomicU16`]
* [`atomic::AtomicU32`]
* [`atomic::AtomicU64`]
* [`atomic::AtomicU8`]
* [`convert::Infallible`]
* [`convert::TryFrom`]
* [`convert::TryInto`]
* [`iter::from_fn`]
* [`iter::successors`]
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* [`num::NonZeroI128`]
* [`num::NonZeroI16`]
* [`num::NonZeroI32`]
* [`num::NonZeroI64`]
* [`num::NonZeroI8`]
* [`num::NonZeroIsize`]
* [`slice::sort_by_cached_key`]
* [`str::escape_debug`]
* [`str::escape_default`]
* [`str::escape_unicode`]
* [`str::split_ascii_whitespace`]

#### std
* [`Instant::checked_add`]
* [`Instant::checked_sub`]
* [`SystemTime::checked_add`]
* [`SystemTime::checked_sub`]

Cargo
-----
- [You can now use alternative registries to crates.io.][cargo/6654]

Misc
----
- [You can now use the `?` operator in your documentation tests without manually
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adding `fn main() -> Result<(), _> {}`.][56470]

Compatibility Notes
-------------------
- [`Command::before_exec` is now deprecated in favor of the
unsafe method `Command::pre_exec`.][58059]
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- [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated.][57425] As you
can now use `const` functions in `static` variables.

[58370]: https://github.com/rust-lang/rust/pull/58370/
[58406]: https://github.com/rust-lang/rust/pull/58406/
[58421]: https://github.com/rust-lang/rust/pull/58421/
[58166]: https://github.com/rust-lang/rust/pull/58166/
[58044]: https://github.com/rust-lang/rust/pull/58044/
[58057]: https://github.com/rust-lang/rust/pull/58057/
[58059]: https://github.com/rust-lang/rust/pull/58059/
[57809]: https://github.com/rust-lang/rust/pull/57809/
[57873]: https://github.com/rust-lang/rust/pull/57873/
[57604]: https://github.com/rust-lang/rust/pull/57604/
[57367]: https://github.com/rust-lang/rust/pull/57367/
[57407]: https://github.com/rust-lang/rust/pull/57407/
[57425]: https://github.com/rust-lang/rust/pull/57425/
[57106]: https://github.com/rust-lang/rust/pull/57106/
[56470]: https://github.com/rust-lang/rust/pull/56470/
[cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
[`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
[`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#tymethod.type_id
[`atomic::AtomicI16`]: https://doc.rust-lang.org/std/atomic/struct.AtomicI16.html
[`atomic::AtomicI32`]: https://doc.rust-lang.org/std/atomic/struct.AtomicI32.html
[`atomic::AtomicI64`]: https://doc.rust-lang.org/std/atomic/struct.AtomicI64.html
[`atomic::AtomicI8`]: https://doc.rust-lang.org/std/atomic/struct.AtomicI8.html
[`atomic::AtomicU16`]: https://doc.rust-lang.org/std/atomic/struct.AtomicU16.html
[`atomic::AtomicU32`]: https://doc.rust-lang.org/std/atomic/struct.AtomicU32.html
[`atomic::AtomicU64`]: https://doc.rust-lang.org/std/atomic/struct.AtomicU64.html
[`atomic::AtomicU8`]: https://doc.rust-lang.org/std/atomic/struct.AtomicU8.html
[`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
[`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
[`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
[`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
[`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
[`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
[`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
[`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
[`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
[`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
[`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
[`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/slice/fn.sort_by_cached_key
[`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
[`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
[`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
[`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
[`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
[`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
[`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
[`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub


Version 1.33.0 (2019-02-28)
==========================

Expand Down Expand Up @@ -99,6 +245,8 @@ Stabilized APIs

Cargo
-----
- [You can now publish crates that require a feature flag to compile with
`cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
- [Cargo should now rebuild a crate if a file was modified during the initial
build.][cargo/6484]

Expand Down Expand Up @@ -135,6 +283,7 @@ Compatibility Notes
[57535]: https://github.com/rust-lang/rust/pull/57535/
[57566]: https://github.com/rust-lang/rust/pull/57566/
[57615]: https://github.com/rust-lang/rust/pull/57615/
[cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
[cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
[`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
[`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
Expand Down