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RELEASES.md
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@ -1,3 +1,329 @@
Version 1.52.0 (2021-05-06)
============================
Language
--------
- [Added the `unsafe_op_in_unsafe_fn` lint, which checks whether the unsafe code
in an `unsafe fn` is wrapped in a `unsafe` block.][79208] This lint
is allowed by default, and may become a warning or hard error in a
future edition.
- [You can now cast mutable references to arrays to a pointer of the same type as
the element.][81479]
Compiler
--------
- [Upgraded the default LLVM to LLVM 12.][81451]
Added tier 3\* support for the following targets.
- [`s390x-unknown-linux-musl`][82166]
- [`riscv32gc-unknown-linux-musl` & `riscv64gc-unknown-linux-musl`][82202]
- [`powerpc-unknown-openbsd`][82733]
\* Refer to Rust's [platform support page][platform-support-doc] for more
information on Rust's tiered platform support.
Libraries
---------
- [`OsString` now implements `Extend` and `FromIterator`.][82121]
- [`cmp::Reverse` now has `#[repr(transparent)]` representation.][81879]
- [`Arc<impl Error>` now implements `error::Error`.][80553]
- [All integer division and remainder operations are now `const`.][80962]
Stabilised APIs
-------------
- [`Arguments::as_str`]
- [`char::MAX`]
- [`char::REPLACEMENT_CHARACTER`]
- [`char::UNICODE_VERSION`]
- [`char::decode_utf16`]
- [`char::from_digit`]
- [`char::from_u32_unchecked`]
- [`char::from_u32`]
- [`slice::partition_point`]
- [`str::rsplit_once`]
- [`str::split_once`]
The following previously stable APIs are now `const`.
- [`char::len_utf8`]
- [`char::len_utf16`]
- [`char::to_ascii_uppercase`]
- [`char::to_ascii_lowercase`]
- [`char::eq_ignore_ascii_case`]
- [`u8::to_ascii_uppercase`]
- [`u8::to_ascii_lowercase`]
- [`u8::eq_ignore_ascii_case`]
Rustdoc
-------
- [Rustdoc lints are now treated as a tool lint, meaning that
lints are now prefixed with `rustdoc::` (e.g. `#[warn(rustdoc::non_autolinks)]`).][80527]
Using the old style is still allowed, and will become a warning in
a future release.
- [Rustdoc now supports argument files.][82261]
- [Rustdoc now generates smart punctuation for documentation.][79423]
- [You can now use "task lists" in Rustdoc Markdown.][81766] E.g.
```markdown
- [x] Complete
- [ ] Todo
```
Misc
----
- [You can now pass multiple filters to tests.][81356] E.g.
`cargo test -- foo bar` will run all tests that match `foo` and `bar`.
- [Rustup now distributes PDB symbols for the `std` library on Windows,
allowing you to see `std` symbols when debugging.][82218]
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.
- [Check the result cache before the DepGraph when ensuring queries][81855]
- [Try fast_reject::simplify_type in coherence before doing full check][81744]
- [Only store a LocalDefId in some HIR nodes][81611]
- [Store HIR attributes in a side table][79519]
Compatibility Notes
-------------------
- [Cargo build scripts are now forbidden from setting `RUSTC_BOOTSTRAP`.][cargo/9181]
- [Removed support for the `x86_64-rumprun-netbsd` target.][82594]
- [Deprecated the `x86_64-sun-solaris` target in favor of `x86_64-pc-solaris`.][82216]
- [Rustdoc now only accepts `,`, ` `, and `\t` as delimiters for specifying
languages in code blocks.][78429]
- [Rustc now catches more cases of `pub_use_of_private_extern_crate`][80763]
- [Changes in how proc macros handle whitespace may lead to panics when used
with older `proc-macro-hack` versions. A `cargo update` should be sufficient to fix this in all cases.][84136]
[84136]: https://github.com/rust-lang/rust/issues/84136
[80763]: https://github.com/rust-lang/rust/pull/80763
[82166]: https://github.com/rust-lang/rust/pull/82166
[82121]: https://github.com/rust-lang/rust/pull/82121
[81879]: https://github.com/rust-lang/rust/pull/81879
[82261]: https://github.com/rust-lang/rust/pull/82261
[82218]: https://github.com/rust-lang/rust/pull/82218
[82216]: https://github.com/rust-lang/rust/pull/82216
[82202]: https://github.com/rust-lang/rust/pull/82202
[81855]: https://github.com/rust-lang/rust/pull/81855
[81766]: https://github.com/rust-lang/rust/pull/81766
[81744]: https://github.com/rust-lang/rust/pull/81744
[81611]: https://github.com/rust-lang/rust/pull/81611
[81479]: https://github.com/rust-lang/rust/pull/81479
[81451]: https://github.com/rust-lang/rust/pull/81451
[81356]: https://github.com/rust-lang/rust/pull/81356
[80962]: https://github.com/rust-lang/rust/pull/80962
[80553]: https://github.com/rust-lang/rust/pull/80553
[80527]: https://github.com/rust-lang/rust/pull/80527
[79519]: https://github.com/rust-lang/rust/pull/79519
[79423]: https://github.com/rust-lang/rust/pull/79423
[79208]: https://github.com/rust-lang/rust/pull/79208
[78429]: https://github.com/rust-lang/rust/pull/78429
[82733]: https://github.com/rust-lang/rust/pull/82733
[82594]: https://github.com/rust-lang/rust/pull/82594
[cargo/9181]: https://github.com/rust-lang/cargo/pull/9181
[`char::MAX`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.MAX
[`char::REPLACEMENT_CHARACTER`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.REPLACEMENT_CHARACTER
[`char::UNICODE_VERSION`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.UNICODE_VERSION
[`char::decode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.decode_utf16
[`char::from_u32`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32
[`char::from_u32_unchecked`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32_unchecked
[`char::from_digit`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_digit
[`Peekable::next_if`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if
[`Peekable::next_if_eq`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if_eq
[`Arguments::as_str`]: https://doc.rust-lang.org/stable/std/fmt/struct.Arguments.html#method.as_str
[`str::split_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_once
[`str::rsplit_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.rsplit_once
[`slice::partition_point`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.partition_point
[`char::len_utf8`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf8
[`char::len_utf16`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf16
[`char::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_uppercase
[`char::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_lowercase
[`char::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.eq_ignore_ascii_case
[`u8::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_uppercase
[`u8::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_lowercase
[`u8::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.eq_ignore_ascii_case
Version 1.51.0 (2021-03-25)
============================
Language
--------
- [You can now parameterize items such as functions, traits, and `struct`s by constant
values in addition to by types and lifetimes.][79135] Also known as "const generics"
E.g. you can now write the following. Note: Only values of primitive integers,
`bool`, or `char` types are currently permitted.
```rust
struct GenericArray<T, const LENGTH: usize> {
inner: [T; LENGTH]
}
impl<T, const LENGTH: usize> GenericArray<T, LENGTH> {
const fn last(&self) -> Option<&T> {
if LENGTH == 0 {
None
} else {
Some(&self.inner[LENGTH - 1])
}
}
}
```
Compiler
--------
- [Added the `-Csplit-debuginfo` codegen option for macOS platforms.][79570]
This option controls whether debug information is split across multiple files
or packed into a single file. **Note** This option is unstable on other platforms.
- [Added tier 3\* support for `aarch64_be-unknown-linux-gnu`,
`aarch64-unknown-linux-gnu_ilp32`, and `aarch64_be-unknown-linux-gnu_ilp32` targets.][81455]
- [Added tier 3 support for `i386-unknown-linux-gnu` and `i486-unknown-linux-gnu` targets.][80662]
- [The `target-cpu=native` option will now detect individual features of CPUs.][80749]
\* Refer to Rust's [platform support page][platform-support-doc] for more
information on Rust's tiered platform support.
Libraries
---------
- [`Box::downcast` is now also implemented for any `dyn Any + Send + Sync` object.][80945]
- [`str` now implements `AsMut<str>`.][80279]
- [`u64` and `u128` now implement `From<char>`.][79502]
- [`Error` is now implemented for `&T` where `T` implements `Error`.][75180]
- [`Poll::{map_ok, map_err}` are now implemented for `Poll<Option<Result<T, E>>>`.][80968]
- [`unsigned_abs` is now implemented for all signed integer types.][80959]
- [`io::Empty` now implements `io::Seek`.][78044]
- [`rc::Weak<T>` and `sync::Weak<T>`'s methods such as `as_ptr` are now implemented for
`T: ?Sized` types.][80764]
- [`Div` and `Rem` by their `NonZero` variant is now implemented for all unsigned integers.][79134]
Stabilized APIs
---------------
- [`Arc::decrement_strong_count`]
- [`Arc::increment_strong_count`]
- [`Once::call_once_force`]
- [`Peekable::next_if_eq`]
- [`Peekable::next_if`]
- [`Seek::stream_position`]
- [`array::IntoIter`]
- [`panic::panic_any`]
- [`ptr::addr_of!`]
- [`ptr::addr_of_mut!`]
- [`slice::fill_with`]
- [`slice::split_inclusive_mut`]
- [`slice::split_inclusive`]
- [`slice::strip_prefix`]
- [`slice::strip_suffix`]
- [`str::split_inclusive`]
- [`sync::OnceState`]
- [`task::Wake`]
- [`VecDeque::range`]
- [`VecDeque::range_mut`]
Cargo
-----
- [Added the `split-debuginfo` profile option to control the -Csplit-debuginfo
codegen option.][cargo/9112]
- [Added the `resolver` field to `Cargo.toml` to enable the new feature resolver
and CLI option behavior.][cargo/8997] Version 2 of the feature resolver will try
to avoid unifying features of dependencies where that unification could be unwanted.
Such as using the same dependency with a `std` feature in a build scripts and
proc-macros, while using the `no-std` feature in the final binary. See the
[Cargo book documentation][feature-resolver@2.0] for more information on the feature.
Rustdoc
-------
- [Rustdoc will now include documentation for methods available from _nested_ `Deref` traits.][80653]
- [You can now provide a `--default-theme` flag which sets the default theme to use for
documentation.][79642]
Various improvements to intra-doc links:
- [You can link to non-path primitives such as `slice`.][80181]
- [You can link to associated items.][74489]
- [You can now include generic parameters when linking to items, like `Vec<T>`.][76934]
Misc
----
- [You can now pass `--include-ignored` to tests (e.g. with
`cargo test -- --include-ignored`) to include testing tests marked `#[ignore]`.][80053]
Compatibility Notes
-------------------
- [WASI platforms no longer use the `wasm-bindgen` ABI, and instead use the wasm32 ABI.][79998]
- [`rustc` no longer promotes division, modulo and indexing operations to `const` that
could fail.][80579]
- [The minimum version of glibc for the following platforms has been bumped to version 2.31
for the distributed artifacts.][81521]
- `armv5te-unknown-linux-gnueabi`
- `sparc64-unknown-linux-gnu`
- `thumbv7neon-unknown-linux-gnueabihf`
- `armv7-unknown-linux-gnueabi`
- `x86_64-unknown-linux-gnux32`
- [`atomic::spin_loop_hint` has been deprecated.][80966] It's recommended to use `hint::spin_loop` instead.
Internal Only
-------------
- [Consistently avoid constructing optimized MIR when not doing codegen][80718]
[79135]: https://github.com/rust-lang/rust/pull/79135
[74489]: https://github.com/rust-lang/rust/pull/74489
[76934]: https://github.com/rust-lang/rust/pull/76934
[79570]: https://github.com/rust-lang/rust/pull/79570
[80181]: https://github.com/rust-lang/rust/pull/80181
[79642]: https://github.com/rust-lang/rust/pull/79642
[80945]: https://github.com/rust-lang/rust/pull/80945
[80279]: https://github.com/rust-lang/rust/pull/80279
[80053]: https://github.com/rust-lang/rust/pull/80053
[79502]: https://github.com/rust-lang/rust/pull/79502
[75180]: https://github.com/rust-lang/rust/pull/75180
[79135]: https://github.com/rust-lang/rust/pull/79135
[81521]: https://github.com/rust-lang/rust/pull/81521
[80968]: https://github.com/rust-lang/rust/pull/80968
[80959]: https://github.com/rust-lang/rust/pull/80959
[80718]: https://github.com/rust-lang/rust/pull/80718
[80653]: https://github.com/rust-lang/rust/pull/80653
[80579]: https://github.com/rust-lang/rust/pull/80579
[79998]: https://github.com/rust-lang/rust/pull/79998
[78044]: https://github.com/rust-lang/rust/pull/78044
[81455]: https://github.com/rust-lang/rust/pull/81455
[80764]: https://github.com/rust-lang/rust/pull/80764
[80749]: https://github.com/rust-lang/rust/pull/80749
[80662]: https://github.com/rust-lang/rust/pull/80662
[79134]: https://github.com/rust-lang/rust/pull/79134
[80966]: https://github.com/rust-lang/rust/pull/80966
[cargo/8997]: https://github.com/rust-lang/cargo/pull/8997
[cargo/9112]: https://github.com/rust-lang/cargo/pull/9112
[feature-resolver@2.0]: https://doc.rust-lang.org/nightly/cargo/reference/features.html#feature-resolver-version-2
[`Once::call_once_force`]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#method.call_once_force
[`sync::OnceState`]: https://doc.rust-lang.org/stable/std/sync/struct.OnceState.html
[`panic::panic_any`]: https://doc.rust-lang.org/stable/std/panic/fn.panic_any.html
[`slice::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
[`slice::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
[`Arc::increment_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.increment_strong_count
[`Arc::decrement_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.decrement_strong_count
[`slice::fill_with`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.fill_with
[`ptr::addr_of!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of.html
[`ptr::addr_of_mut!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of_mut.html
[`array::IntoIter`]: https://doc.rust-lang.org/nightly/std/array/struct.IntoIter.html
[`slice::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive
[`slice::split_inclusive_mut`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive_mut
[`str::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_inclusive
[`task::Wake`]: https://doc.rust-lang.org/nightly/std/task/trait.Wake.html
[`Seek::stream_position`]: https://doc.rust-lang.org/nightly/std/io/trait.Seek.html#method.stream_position
[`Peekable::next_if`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if
[`Peekable::next_if_eq`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if_eq
[`VecDeque::range`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range
[`VecDeque::range_mut`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range_mut
Version 1.50.0 (2021-02-11)
============================
@ -14,7 +340,7 @@ Compiler
- [The `x86_64-unknown-freebsd` is now built with the full toolset.][79484]
- [Dropped support for all cloudabi targets.][78439]
\* Refer to Rust's [platform support page][forge-platform-support] for more
\* Refer to Rust's [platform support page][platform-support-doc] for more
information on Rust's tiered platform support.
Libraries
@ -191,7 +517,7 @@ Compiler
- [Output from threads spawned in tests is now captured.][78227]
- [Change os and vendor values to "none" and "unknown" for some targets][78951]
\* Refer to Rust's [platform support page][forge-platform-support] for more
\* Refer to Rust's [platform support page][platform-support-doc] for more
information on Rust's tiered platform support.
Libraries
@ -296,7 +622,7 @@ Compiler
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
\* Refer to Rust's [platform support page][platform-support-doc] for more
information on Rust's tiered platform support.
Libraries
@ -435,7 +761,7 @@ Compiler
- [Upgrade the FreeBSD toolchain to version 11.4][75204]
- [`RUST_BACKTRACE`'s output is now more compact.][75048]
\* Refer to Rust's [platform support page][forge-platform-support] for more
\* Refer to Rust's [platform support page][platform-support-doc] for more
information on Rust's tiered platform support.
Libraries
@ -720,7 +1046,7 @@ Compiler
- [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
\* Refer to Rust's [platform support page][platform-support-doc] for more
information on Rust's tiered platform support.
@ -1229,7 +1555,7 @@ Compiler
pointing to the location where they were called, rather than
`core`'s internals. ][67887]
\* Refer to Rust's [platform support page][forge-platform-support] for more
\* Refer to Rust's [platform support page][platform-support-doc] for more
information on Rust's tiered platform support.
Libraries
@ -1327,7 +1653,7 @@ Compiler
- [You can now provide `--extern` flag without a path, indicating that it is
available from the search path or specified with an `-L` flag.][64882]
\* Refer to Rust's [platform support page][forge-platform-support] for more
\* Refer to Rust's [platform support page][platform-support-doc] for more
information on Rust's tiered platform support.
[argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
@ -1451,7 +1777,7 @@ Compiler
- [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
`mips64el-unknown-linux-muslabi64` targets.][65843]
\* Refer to Rust's [platform support page][forge-platform-support] for more
\* Refer to Rust's [platform support page][platform-support-doc] for more
information on Rust's tiered platform support.
Libraries
@ -1601,7 +1927,7 @@ Compiler
output of successful tests.][62600]
\* Refer to Rust's [platform support page][forge-platform-support] for more
\* Refer to Rust's [platform support page][platform-support-doc] for more
information on Rust's tiered platform support.
Libraries
@ -1695,7 +2021,7 @@ Compiler
- [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
\* Refer to Rust's [platform support page][platform-support-doc] for more
information on Rust's tiered platform support.
Libraries
@ -1737,6 +2063,11 @@ Cargo
- [You can now pass the `--features` option multiple times to enable
multiple features.][cargo/7084]
Rustdoc
-------
- [Documentation on `pub use` statements is prepended to the documentation of the re-exported item][63048]
Misc
----
- [`rustc` will now warn about some incorrect uses of
@ -1771,6 +2102,7 @@ Compatibility Notes
[63421]: https://github.com/rust-lang/rust/pull/63421/
[cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
[cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
[63048]: https://github.com/rust-lang/rust/pull/63048
[`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
[`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
[`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
@ -1782,7 +2114,7 @@ Compatibility Notes
[`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
[`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
[`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
[forge-platform-support]: https://forge.rust-lang.org/release/platform-support.html
[platform-support-doc]: https://doc.rust-lang.org/nightly/rustc/platform-support.html
[pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
Version 1.37.0 (2019-08-15)