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duration in required but int was passed #257

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4 changes: 3 additions & 1 deletion src/part-guide/async-await.md
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Expand Up @@ -78,13 +78,15 @@ The syntax for using await is `some_future.await`, i.e., it is a postfix keyword
Consider the following functions:

```rust,norun
use tokio::time::{sleep, Duration};

// An async function, but it doesn't need to wait for anything.
async fn add(a: u32, b: u32) -> u32 {
a + b
}

async fn wait_to_add(a: u32, b: u32) -> u32 {
sleep(1000).await;
sleep(Duration::from_millis(1000)).await;
a + b
}
```
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