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Update RELEASES.md for 1.41.0
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Erin Power
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RELEASES.md
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RELEASES.md
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Version 1.41.0 (2020-01-30)
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===========================
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Language
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--------
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- [You can now pass type parameters to foreign items when implementing
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traits.][65879] E.g. You can now write `impl<T> From<Foo> for Vec<T> {}`.
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- [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can
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now write `fn foo(self: Box<Box<Self>>) {}`. Previously only `Self`, `&Self`,
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`&mut Self`, `Arc<Self>`, `Rc<Self>`, and `Box<Self>` were allowed.
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- [You can now use any valid identifier in a `format_args` macro.][66847]
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Previously identifiers starting with an underscore were not allowed.
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- [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and
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enum variants.][66183] These are still rejected semantically, but
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can be seen and parsed by procedural macros and conditional compilation.
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Compiler
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--------
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- [Rustc will now warn if you have unused loop `'label`s.][66325]
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- [Removed support for the `i686-unknown-dragonfly` target.][67255]
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- [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661]
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- [You can now pass an arguments file passing the `@path` syntax
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to rustc.][66172] Note that the format differs somewhat from what is
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found in other tooling; please see [the documentation][argfile-docs] for
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more information.
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- [You can now provide `--extern` flag without a path, indicating that it is
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available from the search path or specified with an `-L` flag.][64882]
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\* Refer to Rust's [platform support page][forge-platform-support] for more
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information on Rust's tiered platform support.
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[argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
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Libraries
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---------
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- [The `core::panic` module is now stable.][66771] It was already stable
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through `std`.
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- [`NonZero*` numerics now implement `From<NonZero*>` if it's a smaller integer
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width.][66277] E.g. `NonZeroU16` now implements `From<NonZeroU8>`.
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- [`MaybeUninit<T>` now implements `fmt::Debug`.][65013]
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Stabilized APIs
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---------------
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- [`Result::map_or`]
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- [`Result::map_or_else`]
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- [`std::rc::Weak::weak_count`]
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- [`std::rc::Weak::strong_count`]
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- [`std::sync::Weak::weak_count`]
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- [`std::sync::Weak::strong_count`]
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Cargo
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-----
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- [Cargo will now document all the private items for binary crates
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by default.][cargo/7593]
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- [`cargo-install` will now reinstall the package if it detects that it is out
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of date.][cargo/7560]
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- [Cargo.lock now uses a more git friendly format that should help to reduce
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merge conflicts.][cargo/7579]
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- [You can now override specific dependencies's build settings][cargo/7591] E.g.
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`[profile.dev.overrides.image] opt-level = 2` sets the `image` crate's
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optimisation level to `2` for debug builds. You can also use
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`[profile.<profile>.build_overrides]` to override build scripts and
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their dependencies.
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Misc
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----
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- [You can now specify `edition` in documentation code blocks to compile the block
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for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample
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should be compiled the 2018 edition of Rust.
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- [You can now provide custom themes to rustdoc with `--theme`, and check the
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current theme with `--check-theme`.][54733]
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- [You can use `#[doc(cfg(item))]` to document that a item is only available with
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certain features.][61351]
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Compatibility Notes
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-------------------
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- [As previously announced 1.41.0 will be the last tier 1 release for 32-bit
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Apple targets.][apple-32bit-drop] This means that the source code is still
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available to build, but the targets are no longer being tested and release
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binaries for those platforms will no longer be distributed by the Rust project.
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Please refer to the linked blog post for more information.
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[54733]: https://github.com/rust-lang/rust/pull/54733/
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[61351]: https://github.com/rust-lang/rust/pull/61351/
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[67255]: https://github.com/rust-lang/rust/pull/67255/
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[66661]: https://github.com/rust-lang/rust/pull/66661/
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[66771]: https://github.com/rust-lang/rust/pull/66771/
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[66847]: https://github.com/rust-lang/rust/pull/66847/
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[66238]: https://github.com/rust-lang/rust/pull/66238/
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[66277]: https://github.com/rust-lang/rust/pull/66277/
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[66325]: https://github.com/rust-lang/rust/pull/66325/
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[66172]: https://github.com/rust-lang/rust/pull/66172/
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[66183]: https://github.com/rust-lang/rust/pull/66183/
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[65879]: https://github.com/rust-lang/rust/pull/65879/
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[65013]: https://github.com/rust-lang/rust/pull/65013/
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[64882]: https://github.com/rust-lang/rust/pull/64882/
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[64325]: https://github.com/rust-lang/rust/pull/64325/
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[cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/
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[cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/
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[cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/
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[cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/
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[`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else
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[`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or
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[`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count
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[`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count
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[`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count
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[`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count
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[apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
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Version 1.40.0 (2019-12-19)
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===========================
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