Tracking Issue for core::future::join! · Issue #91642 · rust-lang/rust (original) (raw)

Feature gate: #![feature(future_join)]

This is a tracking issue for core::future::join!, which polls multiple futures concurrently and returns their outputs.

async fn run() { let (a, b) = join!(async { 0 }, async { 1 }).await; }

Public API

// core::future

pub macro join { ( (((fut:expr),* $(,)?) => { // ... } }

Steps / History

• Implementation: Implement core::future::join! #91645
• Minor improvements: Minor improvements to future::join!'s implementation #91721
• Final comment period (FCP)
• Stabilization PR

Unresolved Questions

• Implicit .await? Tokio and futures currently do this.
• await_all! vs join!
• join/and method on Future: a.and(b).await
• Implement IntoFuture for N-arity tuples? let (a, b, c) = (a, b, c).await