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Overview
async-std and async-task along with their supporting libraries are a two libraries making your life in async programming easier. They provide fundamental implementations for downstream libraries and applications alike.
async-std provides an interface to all important primitives: filesystem operations, network operations and concurrency basics like timers. It also exposes async-task in a model similar to the thread module found in the Rust standard lib. The name reflects the approach of this library: it is a closely modeled to the Rust main standard library as possible, replacing all components by async counterparts. You can read more about async-std in the overview chapter.
async-task is a library for implementing asynchronous tasks quickly. For the purpose of this documentation, you will mainly interact with it through the async_std::task module. Still, it has some nice properties to be aware of, which you can read up on in the async-task overview chapter.