Using async/await with old `Future<Item = X, Error = Y>` types [duplicate]

问题

This question already has an answer here:

Is there a way that we can convert from futures 0.1 to the standard library futures? (1 answer)

Closed 24 days ago.

I have a function in a crate that returns old style futures.

Imagine something like:

pub fn old_function() -> impl Future<Item = X, Error = Y>
...

I want to use this crate in a new codebase where I don't want to mix things too much.

How can I keep the new implementation clean and use async/await when calling this old_function ?

回答1:

The answer was very easy. I write here in case somebody has a similar problem. It is actually part of the async/await primer :)

You need to enable the compat feature

[dependencies]
futures = { version = "0.3.1", features = ["compat"] }

And later it is possible to do:

let x = old_function().compat().await;

来源：https://stackoverflow.com/questions/59976639/using-async-await-with-old-futureitem-x-error-y-types