tokio::join! lets you run multiple futures concurrently, and returns the output of all of them. For JavaScript developers: Promise.all is a good equivalent.

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Tokio macros like `join!`, `select!`, and `pin!` enhance concurrent programming in Rust by allowing multiple futures to run concurrently. `join!` executes futures on the same thread, `select!` races futures against each other and responds to the first one to complete, and `pin!` pins futures in memory to prevent them from being moved. Examples demonstrate usage and best practices.

Tokio: Macros

Exercise 3: Rewrite the Chat Server with Macros #