warning: unused `Result` that must be used
 --> /w/foo.rs:5:5
  |
5 |     io::stdin().read_line(&mut line);
  |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  |
  = note: this `Result` may be an `Err` variant, which should be handled
  = note: `#[warn(unused_must_use)]` on by default
help: use `let _ = ...` to ignore the resulting value
  |
5 |     let _ = io::stdin().read_line(&mut line);
  |     +++++++

warning: 1 warning emitted