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A deep dive into implementing async Rust from scratch without external crates. Explores building a minimal async executor with custom Future implementations, Pin mechanics, Context/Waker internals, and a fake-time simulation using a priority queue. Demonstrates how async/await compiles to state machines and how primitive operations communicate with executors through unsafe RawWaker manipulation. Includes working code for a command-based async system that yields control through a side-channel.

One page of async Rust – Tony Finch