Rust: Async Improvements and Experimental Features
June 10th saw significant async runtime improvements and new experimental language features, with major fixes to async drop behavior and progress on argument splatting syntax for better C++ interop.
Duration: PT2M11S
Episode overview
This episode is a short developer briefing from Rust.
It explains recent repository work in plain language.
- Show: Rust
- Published: 2026-06-10T13:10:56Z
- Audio duration: PT2M11S
Transcript excerpt
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Good morning, it's June 10th, 2026. Yesterday brought substantial improvements to Rust's async runtime along with experimental features aimed at better foreign function interface support.
The biggest async story centers on fixing fundamental issues with async drop behavior. PR 156067 resolved a critical bug where boxed values weren't properly reaching their async destructors in async drop contexts. This required updating the needs-drop analysis to handle Box specially for async drops. Separately, PR…
On the experimental side, we're seeing concrete progress on argument splatting syntax through PRs 157605 and 157699. This feature is part of the broader FFI overloading and C++ interop project goals for 2026. The changes add new AST validation and diagnostic support for splat syntax, which should make it easier to…
The type system also got attention with PR 129543 fixing how trait references and associated type paths handle trait object lifetime defaults. This touched multiple compiler areas including HIR and resolve bound variables, addressing several long-standing issues with lifetime elision behavior. Meanwhile, PR 153847…
Looking ahead, these async improvements should make async…
That'…
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