🆕🦀 Just a few hours ago, Rust 1.61 was released! ✨
Here's a thread with fourteen highlights:
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Here's a thread with fourteen highlights:
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1. `const fn`s can now have trait bounds.
Traits can't have `const fn`s yet, so the use of this feature is limited, though. It does allow using associated constants and types, which makes it possible for more types to provide a const `new` function, which can be very useful.
Traits can't have `const fn`s yet, so the use of this feature is limited, though. It does allow using associated constants and types, which makes it possible for more types to provide a const `new` function, which can be very useful.
2. `impl Trait` syntax can now be used in the signatures of `const fn`s, both as arguments and as the return type.
3. You now create `dyn` trait objects and function pointers and in `const fn`s, and pass them around.
4. Several methods on raw pointers are now `const`: offset, add, sub, wrapping_offset, wrapping_add, and wrapping_sub.
5. `impl Trait` return types now works for recursive functions:
6. std::process::Termination and std::process::ExitCode:
You can implement the Termination trait for your own type, which means your type can be used as the return type of `main`. Returning your type from main can have its own custom behavior and exit code.
You can implement the Termination trait for your own type, which means your type can be used as the return type of `main`. Returning your type from main can have its own custom behavior and exit code.
7. Vec::retain_mut() and VecDeque::retain_mut().
These are the mutable version of Vec::retain() and VecDeque::retain(). They allow you to conditionally drop items from the collection, while also being able to modify them.
These are the mutable version of Vec::retain() and VecDeque::retain(). They allow you to conditionally drop items from the collection, while also being able to modify them.
8. std::thread::JoinHandle::is_finished()
Using this method on JoinHandle, you can check whether the thread is still running or if it has finished, without having to block on .join()'ing it.
Using this method on JoinHandle, you can check whether the thread is still running or if it has finished, without having to block on .join()'ing it.
9. std::thread::available_parallelism() now takes cgroup quotas into account on Linux.
10. You can now create Unix socket SocketAddr objects from a path, using std::os::unix::net::SocketAddr::from_pathname.
11. std::io::stdin().lock(), std::io::stdout().lock() and std::io::stderr().lock() have had their return type slightly tweaked: they now return an object with a 'static lifetime, which means you no longer have to manually keep the intermediary object around:
12. Pin::static_ref()
This function allows you to safely consider a `static` object or leaked allocation 'pinned', as such an object can not safely be moved. This effectively makes the 'static lifetime of a reference satisfy the requirements of Pin.
This function allows you to safely consider a `static` object or leaked allocation 'pinned', as such an object can not safely be moved. This effectively makes the 'static lifetime of a reference satisfy the requirements of Pin.
13. impl Write for std::io::Cursor<[u8; N]>
You could already use `io::Cursor`s that borrow a slice, but now you can also use cursors that own (contain) their data as an array:
You could already use `io::Cursor`s that borrow a slice, but now you can also use cursors that own (contain) their data as an array:
![13. impl Write for std::io::Cursor<[u8; N]>
You could already use `io::Cursor`s that borrow a...](https://pbs.twimg.com/media/FTKB1N2X0AEZm3j.jpg)
14. Tests ignored with #[ignore = "message"] now show their message as part of the test output:
![14. Tests ignored with #[ignore = "message"] now show their message as part of the test output: http...](https://pbs.twimg.com/media/FTKCrtUXwAML7pX.jpg)
![14. Tests ignored with #[ignore = "message"] now show their message as part of the test output: http...](https://pbs.twimg.com/media/FTKCoUMXwBYfD0K.jpg)
And that's all I wanted to highlight!
For a more complete list of changes in Rust 1.61, check the release notes:
Rust: #version-1610-2022-05-19" target="_blank" rel="noopener" onclick="event.stopPropagation()">github.com
Cargo: #cargo-161-2022-05-19" target="_blank" rel="noopener" onclick="event.stopPropagation()">github.com
Clippy: #rust-161" target="_blank" rel="noopener" onclick="event.stopPropagation()">github.com
Enjoy! ✨🦀
16/16
For a more complete list of changes in Rust 1.61, check the release notes:
Rust: #version-1610-2022-05-19" target="_blank" rel="noopener" onclick="event.stopPropagation()">github.com
Cargo: #cargo-161-2022-05-19" target="_blank" rel="noopener" onclick="event.stopPropagation()">github.com
Clippy: #rust-161" target="_blank" rel="noopener" onclick="event.stopPropagation()">github.com
Enjoy! ✨🦀
16/16
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