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`async_fn_traits`

src/doc/unstable-book/src/library-features/async-fn-traits.md

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async_fn_traits

See Also: fn_traits

The async_fn_traits feature allows for implementation of the AsyncFn* traits for creating custom closure-like types that return futures.

The main difference to the Fn* family of traits is that AsyncFn can return a future that borrows from itself (FnOnce::Output has no lifetime parameters, while AsyncFnMut::CallRefFuture does).