Rust 1.67.0 Release: Key Fixes and Improvements
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Chapter 1: Recap of Rust Updates
In October 2022, I shared insights on the Rust 1.64 release, highlighting how it improved compiler performance on Windows by 10 to 20%. Following that, in December, I introduced some intriguing Rust projects. Earlier this year, I began a series focusing on Rust traits. Today, we’ll take a look at the developments since October, particularly the recent release of Rust 1.67.0.
Section 1.1: Fixing Rounding Inconsistencies
The recent update includes a crucial fix for rounding issues. As reported by John Bartholomew, Rust previously exhibited inconsistent rounding behavior, particularly when handling halves of numbers.
Traditionally, Rust rounds halves to the nearest even integer—meaning 1.5 rounds to 2, 3.5 to 4, and 2.5 to 2. However, there was an exception where Rust would round 0.5 to 1 instead of the nearest even number, 0. This bug has been resolved in the latest version.
Section 1.2: Enhancements in Closure Signature Deductions
One of the more frustrating aspects of coding in Rust has been the handling of closure signatures, especially when complex supertrait obligations arise. The new release aims to address this issue.
To paraphrase, the system now elaborates on supertrait obligations linked to any registered predicates for a closure, allowing for more accurate inference of closure signatures. While this fix may not be as comprehensive as desired, it still enhances the current functionality.
Subsection 1.2.1: Improved Linter Functionality
With the latest update, the linter now recognizes the #[must_use] attribute not just for Future, but also for Future::Output, thereby providing appropriate error reporting for relevant code snippets.
Section 1.3: Coinductiveness of Sized
The concept of coinductiveness regarding Sized has made a return in Rust. For further details, you can explore additional resources linked at the end of this article.
Chapter 2: Conclusion and Further Resources
In addition to these major fixes, there are several minor updates that have also been implemented.
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