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Rust · Concept

Tokio runtime

Rust asynchronous code uses futures to represent work that may finish later. The async and await keywords let code pause and resume while futures become ready.

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Syntax

async fn name(...) -> ReturnType { ... }
async { ... }
future.await

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  • Future trait
  • async functions
  • async blocks
  • await keyword
  • executor

Source: Futures and the Async Syntax - The Rust Programming Language. Checked 2026-11-03.