Stream error handling

[arturoc]

Is there anyway to handle errors while producing an stream? For example in code like the following:

#[rocket::get("/")]
async fn index() -> TextStream![String] {
    //....
    TextStream!{
        let result = file.read_to_string(buf);
        if result.is_ok() {
            yield buf
        }else{
            // What to do in case of error? 
        }
    }
}

Is there anyway to detect an error an cancel the stream somehow?