Async practice problems in Rust

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Title	Difficulty	Category
A logical-time reactor: timers without a clock	Hard	End-to-End
Async recursion, async closures, and streams	Hard	Research
`block_on`: poll a future to completion	Easy	Primitives
Cancelling a future by dropping it	Medium	Framework
Cancel safety, blocking, and locks across `.await`	Hard	End-to-End
Capstone: an async executor with a logical-time reactor	Hard	End-to-End
Countdown futures and the shape of `Pending`	Easy	Primitives
Create, drop and run futures	Easy	Primitives
Fairness and starvation in your scheduler	Medium	Framework
Hand-compile an `async fn` into a state machine	Hard	Framework
Join two futures and keep both results	Medium	Framework
`poll_fn`: a future from a closure	Easy	Primitives
Queue another poll with Wake	Medium	Framework
Race two futures with a defined polling order	Medium	Framework
`RawWaker` and `RawWakerVTable`: building a `Waker` with unsafe	Hard	Framework
Spawning, `JoinHandle`, and getting values back out	Hard	End-to-End
Structural pinning and safe pin projection by hand	Hard	Research
The `Future` trait: `Output`, `Poll`, and your first hand-written future	Easy	Primitives
The minimal single-threaded executor	Hard	End-to-End
`Unpin` in practice: making `Pin<&mut Self>` usable without unsafe	Medium	Framework