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Document async_fn_traits

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Oli Scherer 2024-02-02 09:25:16 +00:00 • committed by Michael Goulet
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src/doc/unstable-book/src/library-features/async-fn-traits.md Normal file
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# `async_fn_traits`
See Also: [`fn_traits`](../library-features/fn-traits.md)
----
The `async_fn_traits` feature allows for implementation of the [`AsyncFn*`] traits
for creating custom closure-like types that return futures.
[`AsyncFn*`]: ../../std/ops/trait.AsyncFn.html
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 `AsyncFn::CallFuture` does).