ch2-simple-with-linenums.rs

fn main() {
  let search_term = "picture";
  let quote = "\                                      // <1>
Every face, every shop, bedroom window, public-house, and
dark square is a picture feverishly turned--in search of what?
It is the same with books. What do we seek through millions of pages?";
  let mut line_num: usize = 1;               // <2>

  for line in quote.lines() {
    if line.contains(search_term) {
      println!("{}: {}", line_num, line);    // <3>
    }
    line_num += 1;                           // <4>
  }
}