fn main() {
    let info_lines = "foo bar\ngoo jar\ntoo far\n";
    let lines_containing_goo = info_lines.split("\n").filter(|line|
        match line.split_whitespace().next() {
            Some(word) => word.contains("goo"),
            None => false,
        }
    );

    for info_line in lines_containing_goo {
        println!("{}", info_line);
    }
}