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If you have an iterator of `Result`s, you can collect and unwrap all values into a `Vec` on success or return the first `Err` found:
let files_contents = file_names.iter().map(read_file).collect::<Result<Vec<_>, _>>()?;
If you did `.collect::<Vec<_>>()` instead, you'd have an array of mixed `Ok`/`Err` values.
See in #Rust playground: https://is.gd/4GZ45I
