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1.86.0 released by @rust - New features: trait upcasting, HashMaps and slices indexing multiple elements mutably, safe functions marked with #[target_feature], debug assertions that pointers are non-null when required for soundness, make missing_abi lint warn by default, etc. https://blog.rust-lang.org/2025/04/03/Rust-1.86.0.html #RustLang #OpenSource #cybersecurity #software #engineering #tech
![article overview screenshot - follow link for full text
Rust Blog
Announcing Rust 1.86.0
Apr. 3, 2025 · The Rust Release Team
The Rust team is happy to announce a new version of Rust, 1.86.0. Rust is a programming language empowering everyone to build reliable and efficient software.
What's in 1.86.0 stable
Trait upcasting
This release includes a long awaited feature — the ability to upcast trait objects. If a trait has a supertrait you can coerce a reference to said trait object to a reference to a trait object of the supertrait:
trait Trait: Supertrait {}
trait Supertrait {}
fn upcast(x: &dyn Trait) -> &dyn Supertrait {
x
}
The same would work with any other kind of (smart-)pointer, like Arc<dyn Trait> -> Arc<dyn Supertrait> or *const dyn Trait -> *const dyn Supertrait.
[...]](https://files.pnw.zone/media_attachments/files/114/275/448/354/378/910/original/699999ff4b9d9bd3.png "article overview screenshot - follow link for full text
Rust Blog
Announcing Rust 1.86.0
Apr. 3, 2025 · The Rust Release Team
The Rust team is happy to announce a new version of Rust, 1.86.0. Rust is a programming language empowering everyone to build reliable and efficient software.
What's in 1.86.0 stable
Trait upcasting
This release includes a long awaited feature — the ability to upcast trait objects. If a trait has a supertrait you can coerce a reference to said trait object to a reference to a trait object of the supertrait:
trait Trait: Supertrait {}
trait Supertrait {}
fn upcast(x: &dyn Trait) -> &dyn Supertrait {
x
}
The same would work with any other kind of (smart-)pointer, like Arc<dyn Trait> -> Arc<dyn Supertrait> or *const dyn Trait -> *const dyn Supertrait.
[...]")