You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: multifile.rs
    path of file: ./repos/ariadne/examples
    
    the code of the file until where you have to start completion: use ariadne::{Report, ReportKind, Label, ColorGenerator, Fmt, sources};

fn main() {
    let mut colors = ColorGenerator::new();

    // Generate some colours for each of our elements
    let a = colors.next();
    let b = colors.next();
    let c = colors.next();

    Report::build(ReportKind::Error, "b.tao", 10)
        .with_code(3)
        .with_message(format!("Cannot add types Nat and Str"))
        .with_label(Label::new(("b.tao", 10..14))
            .with_message
    
fn main() {
    let mut colors = ColorGenerator::new();

    // Generate some colours for each of our elements
    let a = colors.next();
    let b = colors.next();
    let c = colors.next();

    Report::build(ReportKind::Error, "b.tao", 10)
        .with_code(3)
        .with_message(format!("Cannot add types Nat and Str"))
        .with_label(Label::new(("b.tao", 10..14))
            .with_message(format!("This is of type {}", "Nat".fg(a)))
            .with_color(a))
        .with_label(Label::new(("b.tao", 17..20))
            .with_message(format!("This is of type {}", "Str".fg(b)))
            .with_color(b))
        .with_label(Label::new(("b.tao", 15..16))
            .with_message(format!(" {} and {} undergo addition here", "Nat".fg(a), "Str".fg(b)))
            .with_color(c)
            .with_order(10))
        .with_label(Label::new(("a.tao", 4..8))
            .with_message(format!("Original definition of {} is here", "five".fg(a)))
            .with_color(a))
        .with_note(format!("{} is a number and can only be added to other numbers", "Nat".fg(a)))
        .finish()
        .print(sources(vec![
            ("a.tao", include_str!("a.tao")),
            ("b.tao", include_str!("b.tao")),
        ]))
        .unwrap();
}