- [You can now use the `?` operator in macro definitions.][56245] The `?`
operator allows you to specify zero or one repetitions similar to the `*` and
`+` operators.
+- [Module paths with no leading keyword like `super`, `self`, or `crate`, will
+ now always resolve to the item (`enum`, `struct`, etc.) available in the
+ module if present, before resolving to a external crate or an item the prelude.][56759]
+ E.g.
+ ```rust
+ enum Color { Red, Green, Blue }
+
+ use Color::*;
+ ```
#### All editions
- [You can now match against `PhantomData<T>` types.][55837]
- [You can now match against literals in macros with the `literal`
specifier.][56072] This will match against a literal of any type.
E.g. `1`, `'A'`, `"Hello World"`
-- [Self can now be used as a constructor and pattern.][56365] E.g.
+- [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
```rust
struct Point(i32, i32);
```rust
enum List<T>
where
- Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
+ Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
{
- Nil,
- Cons(T, Box<Self>) // likewise here
+ Nil,
+ Cons(T, Box<Self>) // likewise here
}
```
+- [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
+ a `impl Trait` or `dyn Trait` is returned and unused in the program.
Compiler
--------
-- [You can now mark traits with `#[must_use]`.][55663] Providing a warning if
- they unused in a program.
- [The default allocator has changed from jemalloc to the default allocator on
your system.][55238] The compiler itself on Linux & macOS will still use
- jemalloc, but programs compiled with them will use the system allocator.
+ jemalloc, but programs compiled with it will use the system allocator.
- [Added the `aarch64-pc-windows-msvc` target.][55702]
Libraries
- [`RangeInclusive::start`]
- [`RangeInclusive::end`]
- [`NonNull::as_ptr`]
-- [`[T]::as_ptr`]
+- [`slice::as_ptr`]
- [`str::as_ptr`]
- [`Duration::as_secs`]
- [`Duration::subsec_millis`]
- [`i64::from_be_bytes`]
- [`i64::from_le_bytes`]
- [`i64::from_ne_bytes`]
+- [`i128::to_be_bytes`]
+- [`i128::to_le_bytes`]
+- [`i128::to_ne_bytes`]
+- [`i128::from_be_bytes`]
+- [`i128::from_le_bytes`]
+- [`i128::from_ne_bytes`]
- [`isize::to_be_bytes`]
- [`isize::to_le_bytes`]
- [`isize::to_ne_bytes`]
- [`u64::from_be_bytes`]
- [`u64::from_le_bytes`]
- [`u64::from_ne_bytes`]
+- [`u128::to_be_bytes`]
+- [`u128::to_le_bytes`]
+- [`u128::to_ne_bytes`]
+- [`u128::from_be_bytes`]
+- [`u128::from_le_bytes`]
+- [`u128::from_ne_bytes`]
- [`usize::to_be_bytes`]
- [`usize::to_le_bytes`]
- [`usize::to_ne_bytes`]
been changed from `*const` to `*mut` as the previous implementation
was unsound.
+
[55148]: https://github.com/rust-lang/rust/pull/55148/
[55238]: https://github.com/rust-lang/rust/pull/55238/
[55280]: https://github.com/rust-lang/rust/pull/55280/
[56365]: https://github.com/rust-lang/rust/pull/56365/
[56366]: https://github.com/rust-lang/rust/pull/56366/
[56395]: https://github.com/rust-lang/rust/pull/56395/
+[56759]: https://github.com/rust-lang/rust/pull/56759/
[cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
[cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
[`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
[`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
[`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
[`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
-[`[T]::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
+[`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
[`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
+[`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
+[`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
+[`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
+[`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
+[`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
+[`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
[`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
[`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
[`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
[`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
[`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
[`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
+[`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
+[`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
+[`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
+[`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
+[`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
+[`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
[`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
[`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
[`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
projects / rust.git / blobdiff