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The entry point of the program was marked as `async`.
Erroneous code example:
```compile_fail,E0752
async fn main() -> Result<(), ()> { // error!
Ok(())
}
```
`fn main()` or the specified start function is not allowed to be `async`. Not
having a correct async runtime library setup may cause this error. To fix it,
declare the entry point without `async`:
```
fn main() -> Result<(), ()> { // ok!
Ok(())
}
```
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