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Suggest LocalBoxFuture specifically

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Matt Fellenz 2022-04-18 10:54:01 -07:00
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actix-web/src/extract.rs
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@ -68,9 +68,13 @@ pub trait FromRequest: Sized {
/// Future that resolves to a Self.
///
/// To refer to the type of an async function or block here, you have two options.
/// The first is to use a boxed future such as `futures::future::BoxFuture`. This works on stable and nightly.
/// The second is to use `impl Future`, which requires `#![feature(type_alias_impl_trait)]` so only works on nightly.
/// To use an async function or block here, you can a boxed future such as `futures::future::LocalBoxFuture`.
/// This is an alias for a pinned Box, so you can create it with the following syntax:
/// ```
/// Box::pin(async {
/// ...
/// })
/// ```
type Future: Future<Output = Result<Self, Self::Error>>;
/// Create a Self from request parts asynchronously.