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a70f7203a4
Used for stack pinning and based on `pin_mut!` from the pin-util crate. Pinning is used often when working with stream operators and the select! macro. Given the small size of `pin!` it makes more sense to include a version than re-export one from a separate crate or require the user to depend on `pin-util` themselves.
Tests that require additional components than just the tokio crate.