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#![allow(dead_code)]
use std::{error::Error, io, process};
use serde::Deserialize;
// By default, struct field names are deserialized based on the position of
// a corresponding field in the CSV data's header record.
#[derive(Debug, Deserialize)]
struct Record {
city: String,
region: String,
country: String,
population: Option<u64>,
}
fn example() -> Result<(), Box<dyn Error>> {
let mut rdr = csv::Reader::from_reader(io::stdin());
for result in rdr.deserialize() {
// Notice that we need to provide a type hint for automatic
// deserialization.
let record: Record = result?;
println!("{:?}", record);
}
Ok(())
}
fn main() {
if let Err(err) = example() {
println!("error running example: {}", err);
process::exit(1);
}
}
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