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Clarify async fn return type

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Brad Gibson 2019-08-17 19:53:12 -07:00 committed by GitHub
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docs/src/concepts/futures.md
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@ -102,7 +102,7 @@ While the `Future` trait has existed in Rust for a while, it was inconvenient to
Amazingly little difference, right? All we did is label the function `async` and insert 2 special commands: `.await`.
This function sets up a deferred computation. When this function is called, it will produce a `Future<Output=String>` instead of immediately returning a String. (Or, more precisely, generate a type for you that implements `Future<Output=String>`.)
This function sets up a deferred computation. When this function is called, it will produce a `Future<Output=Result<String, io::Error>>` instead of immediately returning a `Result<String, io::Error>`. (Or, more precisely, generate a type for you that implements `Future<Output=Result<String, io::Error>>`.)
## What does `.await` do?